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Volumn , Issue , 2009, Pages 9-20

Defensive mutualism and grass endophytes: Still valid after all these years?

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EID: 77956505120     PISSN: None     EISSN: None     Source Type: Book    
DOI: None     Document Type: Chapter
Times cited : (21)

References (66)
  • 3
    • 0010048544 scopus 로고
    • Sleepy grass and its effect on horses
    • Bailey, V. 1903. Sleepy grass and its effect on horses. Science 17:392-393.
    • (1903) Science , vol.17 , pp. 392-393
    • Bailey, V.1
  • 4
    • 34249980349 scopus 로고    scopus 로고
    • Broad-scale geographic patterns in the distribution of vertically-transmitted, asexual endophytes in four naturally-occurring grasses in Sweden
    • Bazely, D. R., Ball, J. P., et al. 2007. Broad-scale geographic patterns in the distribution of vertically-transmitted, asexual endophytes in four naturally-occurring grasses in Sweden. Ecography 30:367-374.
    • (2007) Ecography , vol.30 , pp. 367-374
    • Bazely, D.R.1    Ball, J.P.2
  • 5
    • 0004259135 scopus 로고
    • The University of Chicago Press, Chicago (reprinted)
    • Belt, T. 1874. The Naturalist in Nicaragua. The University of Chicago Press, Chicago (reprinted 1985).
    • (1874) The Naturalist in Nicaragua
    • Belt, T.1
  • 6
    • 0000500904 scopus 로고
    • Constraints on chemical coevolution: Wild parsnips and the parsnip webworm
    • Berenbaum, M. R., Zangerl, A. R., and J. K. Nitao. 1986. Constraints on chemical coevolution: Wild parsnips and the parsnip webworm. Evolution 40:1215-1228.
    • (1986) Evolution , vol.40 , pp. 1215-1228
    • Berenbaum, M.R.1    Zangerl, A.R.2    Nitao, J.K.3
  • 8
    • 0002694558 scopus 로고
    • Yield and persistence of tall fescue in the southeastern coastal plain after removal of its endophyte
    • Bouton, J. H., Gates, R. N., Belesky, D. P., and M. Owsley. 1993. Yield and persistence of tall fescue in the southeastern coastal plain after removal of its endophyte. Agronomy Journal 85:52-55.
    • (1993) Agronomy Journal , vol.85 , pp. 52-55
    • Bouton, J.H.1    Gates, R.N.2    Belesky, D.P.3    Owsley, M.4
  • 9
    • 0035026672 scopus 로고    scopus 로고
    • Epichloë grass endophytes increase herbivore resistance in the woodland grass Brachypodium sylvaticum
    • Brem, D. and A. Leuchtmann. 2001. Epichloë grass endophytes increase herbivore resistance in the woodland grass Brachypodium sylvaticum. Oecologia 126:522-530.
    • (2001) Oecologia , vol.126 , pp. 522-530
    • Brem, D.1    Leuchtmann, A.2
  • 10
    • 0026301185 scopus 로고
    • Selection of benevolence in host-parasite system
    • Bull, J. J., Molineux, I. J., and W. R. Rice. 1991. Selection of benevolence in host-parasite system. Evolution 45:875-882.
    • (1991) Evolution , vol.45 , pp. 875-882
    • Bull, J.J.1    Molineux, I.J.2    Rice, W.R.3
  • 11
    • 0031417176 scopus 로고    scopus 로고
    • Bioprotective alkaloids of grass-fungal endophyte symbioses
    • Bush, L. P., Wilkinson, H. H., and C. L. Schardl. 1997. Bioprotective alkaloids of grass-fungal endophyte symbioses. Plant Physiology 114:1-7.
    • (1997) Plant Physiology , vol.114 , pp. 1-7
    • Bush, L.P.1    Wilkinson, H.H.2    Schardl, C.L.3
  • 12
    • 0037381203 scopus 로고    scopus 로고
    • Interactive effects of fungal endophyte infection and host genotype on growth and storage in Lolium perenne
    • Cheplick, G. P. and R. Cho. 2003. Interactive effects of fungal endophyte infection and host genotype on growth and storage in Lolium perenne. New Phytologist 158:183-191.
    • (2003) New Phytologist , vol.158 , pp. 183-191
    • Cheplick, G.P.1    Cho, R.2
  • 13
    • 0024876864 scopus 로고
    • Interactions between infection by endophytic fungi and nutrient limitation in the grasses Lolium perenne and Festuca arundinacea
    • Cheplick, G. P., Clay, K., and S. Marks. 1989. Interactions between infection by endophytic fungi and nutrient limitation in the grasses Lolium perenne and Festuca arundinacea. New Phytologist 111:89-98.
    • (1989) New Phytologist , vol.111 , pp. 89-98
    • Cheplick, G.P.1    Clay, K.2    Marks, S.3
  • 14
    • 0021538820 scopus 로고
    • The effect of the fungus Atkinsonella hypoxylon (Clavicipitaceae) on the reproductive system and demography of the grass Danthonia spicata
    • Clay, K. 1984. The effect of the fungus Atkinsonella hypoxylon (Clavicipitaceae) on the reproductive system and demography of the grass Danthonia spicata. New Phytologist 98:165-175.
    • (1984) New Phytologist , vol.98 , pp. 165-175
    • Clay, K.1
  • 15
    • 0000138472 scopus 로고
    • Induced vivipary in the sedge Cyperus virens and the transmission of the fungus Balansia cyperi (Clavicipitaceae)
    • Clay, K. 1986. Induced vivipary in the sedge Cyperus virens and the transmission of the fungus Balansia cyperi (Clavicipitaceae). Canadian Journal of Botany 64:2984-2988.
    • (1986) Canadian Journal of Botany , vol.64 , pp. 2984-2988
    • Clay, K.1
  • 16
    • 0024194334 scopus 로고
    • Fungal endophytes of grasses: A defensive mutualism between plants and fungi
    • Clay, K. 1988a. Fungal endophytes of grasses: A defensive mutualism between plants and fungi. Ecology 69:10-16.
    • (1988) Ecology , vol.69 , pp. 10-16
    • Clay, K.1
  • 17
    • 0003167751 scopus 로고
    • Clavicipitaceous fungal endophytes of grasses: Coevolution and the change from parasitism to mutualism
    • eds. D. L. Hawksworth and K. Pirozynski, Academic Press, London
    • Clay, K. 1988b. Clavicipitaceous fungal endophytes of grasses: Coevolution and the change from parasitism to mutualism. In Co-evolution of Fungi with Plants and Animals, eds. D. L. Hawksworth and K. Pirozynski, pp. 79-105. Academic Press, London.
    • (1988) Co-evolution of Fungi with Plants and Animals , pp. 79-105
    • Clay, K.1
  • 18
    • 0003390460 scopus 로고    scopus 로고
    • Fungal endophytes, herbivores and the structure of grassland communities
    • eds. A. C. Gange and V. K. Brown, Blackwell Scientific Publishers, Oxford
    • Clay, K. 1997. Fungal endophytes, herbivores and the structure of grassland communities. In Multitrophic Interactions in Terrestrial Systems, eds. A. C. Gange and V. K. Brown, pp. 151-169. Blackwell Scientific Publishers, Oxford.
    • (1997) Multitrophic Interactions in Terrestrial Systems , pp. 151-169
    • Clay, K.1
  • 19
    • 0030620271 scopus 로고    scopus 로고
    • Infection of Holcus lanatus and H. mollis by Epichloë in experimental grasslands
    • Clay, K. and V. K. Brown. 1997. Infection of Holcus lanatus and H. mollis by Epichloë in experimental grasslands. Oikos 79:363-370.
    • (1997) Oikos , vol.79 , pp. 363-370
    • Clay, K.1    Brown, V.K.2
  • 20
    • 0001730210 scopus 로고
    • Effect of ergot alkaloids from fungal endophyte-infected grasses on the fall armyworm (Spodoptera frugiperda)
    • Clay, K. and G. P. Cheplick. 1989. Effect of ergot alkaloids from fungal endophyte-infected grasses on the fall armyworm (Spodoptera frugiperda). Journal of Chemical Ecology 15:169-182.
    • (1989) Journal of Chemical Ecology , vol.15 , pp. 169-182
    • Clay, K.1    Cheplick, G.P.2
  • 21
    • 0030389133 scopus 로고    scopus 로고
    • Evolution and stasis in plant/pathogen associations
    • Clay, K. and P. Kover. 1996. Evolution and stasis in plant/pathogen associations. Ecology 77:997-1003.
    • (1996) Ecology , vol.77 , pp. 997-1003
    • Clay, K.1    Kover, P.2
  • 22
    • 24644524142 scopus 로고    scopus 로고
    • Herbivores cause a rapid increase in hereditary symbiosis and alter plant community composition
    • Clay, K., Holah, J., and J. A. Rudgers. 2005. Herbivores cause a rapid increase in hereditary symbiosis and alter plant community composition. Proceedings of the National Academy of Science USA 102:12465-12470.
    • (2005) Proceedings of the National Academy of Science USA , vol.102 , pp. 12465-12470
    • Clay, K.1    Holah, J.2    Rudgers, J.A.3
  • 23
    • 0033594414 scopus 로고    scopus 로고
    • Fungus-growing ants use antibiotic producing bacteria to control garden parasites
    • Currie, C. R., Scott, J. A., Summerbell, R. C., and D. Malloch. 1999. Fungus-growing ants use antibiotic producing bacteria to control garden parasites. Nature 398:701-704.
    • (1999) Nature , vol.398 , pp. 701-704
    • Currie, C.R.1    Scott, J.A.2    Summerbell, R.C.3    Malloch, D.4
  • 24
    • 0023083409 scopus 로고
    • Transmission modes and evolution of the parasitism-mutualism continuum
    • Ewald, P. 1987. Transmission modes and evolution of the parasitism-mutualism continuum. Annals of the New York Academy of Sciences 503:295-306.
    • (1987) Annals of the New York Academy of Sciences , vol.503 , pp. 295-306
    • Ewald, P.1
  • 25
    • 33646466314 scopus 로고    scopus 로고
    • Temporal and spatial variation in alkaloid levels in Achnatherum robustum, a native grass infected with the endophyte Neotyphodium
    • Faeth, S. H., Gardner, D. R., et al. 2006. Temporal and spatial variation in alkaloid levels in Achnatherum robustum, a native grass infected with the endophyte Neotyphodium. Journal of Chemical Ecology 32:307-324.
    • (2006) Journal of Chemical Ecology , vol.32 , pp. 307-324
    • Faeth, S.H.1    Gardner, D.R.2
  • 26
    • 27744512496 scopus 로고    scopus 로고
    • Diversification of transmission modes and the evolution of mutualism
    • Ferdy, J. B. and B. Godelle. 2005. Diversification of transmission modes and the evolution of mutualism. American Naturalist 166:613-627.
    • (2005) American Naturalist , vol.166 , pp. 613-627
    • Ferdy, J.B.1    Godelle, B.2
  • 27
    • 0242699693 scopus 로고
    • The raison d'etre of secondary plant substances
    • Fraenkel, G. S. 1959. The raison d'etre of secondary plant substances. Science 129:1466-1470.
    • (1959) Science , vol.129 , pp. 1466-1470
    • Fraenkel, G.S.1
  • 28
    • 15744384877 scopus 로고    scopus 로고
    • Soil carbon, nitrogen, and ergot alkaloids with short- and longterm exposure to endophyte-infected and endophyte-free tall fescue
    • Franzluebbers, A. J. and N. S. Hill. 2005. Soil carbon, nitrogen, and ergot alkaloids with short- and longterm exposure to endophyte-infected and endophyte-free tall fescue. Soil Science Society of America 69:404-112.
    • (2005) Soil Science Society of America , vol.69 , pp. 112-404
    • Franzluebbers, A.J.1    Hill, N.S.2
  • 29
    • 85124446006 scopus 로고    scopus 로고
    • Soil carbon and nitrogen pools in response to tall fescue endo-phyte infection, fertilization, and cultivar
    • Franzluebbers, A. J. and J. Studemann. 2005. Soil carbon and nitrogen pools in response to tall fescue endo-phyte infection, fertilization, and cultivar. Soil Science Society of America Journal 69:396-103.
    • (2005) Soil Science Society of America Journal , vol.69 , pp. 103-396
    • Franzluebbers, A.J.1    Studemann, J.2
  • 30
    • 0027089196 scopus 로고
    • The effect of silica in grasses on the feeding behavior of the prairie vole, Microtus ochrogaster
    • Gali-Muhtasib, H. U., Smith, C. C., and J. J. Higgins. 1992. The effect of silica in grasses on the feeding behavior of the prairie vole, Microtus ochrogaster. Ecology 73:1724-1729.
    • (1992) Ecology , vol.73 , pp. 1724-1729
    • Gali-Muhtasib, H.U.1    Smith, C.C.2    Higgins, J.J.3
  • 32
    • 84979320912 scopus 로고
    • Observations on population structure and longevity of Festuca rubra L
    • Harberd, D. J. 1961. Observations on population structure and longevity of Festuca rubra L. New Phytologist 60:184-206.
    • (1961) New Phytologist , vol.60 , pp. 184-206
    • Harberd, D.J.1
  • 33
    • 0002327706 scopus 로고
    • The natural history of mutualisms
    • ed. D. H. Boucher, Oxford University Press, New York
    • Janzen, D. H. 1985. The natural history of mutualisms. In The Biology of Mutualism, ed. D. H. Boucher, pp. 40-99. Oxford University Press, New York.
    • (1985) The Biology of Mutualism , pp. 40-99
    • Janzen, D.H.1
  • 34
    • 33751255383 scopus 로고    scopus 로고
    • Assessing short-term responses of prokaryotic communities in bulk and rhizosphere soils to tall fescue endophyte infection
    • Jenkins, M. B., Franzluebbers, A. J., and S. B. Humayoun. 2006. Assessing short-term responses of prokaryotic communities in bulk and rhizosphere soils to tall fescue endophyte infection. Plant Soil 289:309-320.
    • (2006) Plant Soil , vol.289 , pp. 309-320
    • Jenkins, M.B.1    Franzluebbers, A.J.2    Humayoun, S.B.3
  • 36
    • 38449114157 scopus 로고    scopus 로고
    • Herbivory mediates grass-endophyte relationships
    • Koh, S. and D. S. Hik. 2007. Herbivory mediates grass-endophyte relationships. Ecology 88:2752-2757.
    • (2007) Ecology , vol.88 , pp. 2752-2757
    • Koh, S.1    Hik, D.S.2
  • 37
    • 0031452386 scopus 로고    scopus 로고
    • Potential versus realized transmission rates of a vertically and horizontally transmitted plant pathogen
    • Kover, P. X., Dolan, T. E., and K. Clay. 1997. Potential versus realized transmission rates of a vertically and horizontally transmitted plant pathogen. Proceedings of the Royal Society of London B 264:903-909.
    • (1997) Proceedings of the Royal Society of London B , vol.264 , pp. 903-909
    • Kover, P.X.1    Dolan, T.E.2    Clay, K.3
  • 38
    • 4344680650 scopus 로고    scopus 로고
    • Elimination of ergoline alkaloids following treatment of Ipomoea asarifolia (Convolvulaceae) with fungicides
    • Kucht, S., Gross, J., et al. 2004. Elimination of ergoline alkaloids following treatment of Ipomoea asarifolia (Convolvulaceae) with fungicides. Planta 219:619-625.
    • (2004) Planta , vol.219 , pp. 619-625
    • Kucht, S.1    Gross, J.2
  • 39
    • 0001727997 scopus 로고
    • Isozyme variation in the Acremonium/Epichloë fungal endophyte complex
    • Leuchtmann, A. and K. Clay. 1990. Isozyme variation in the Acremonium/Epichloë fungal endophyte complex. Phytopathology 80:1133-1139.
    • (1990) Phytopathology , vol.80 , pp. 1133-1139
    • Leuchtmann, A.1    Clay, K.2
  • 40
    • 0034097319 scopus 로고    scopus 로고
    • Different levels of protective alkaloids in grasses with stroma-forming and seed-transmitted Epichloë/Neotyphodium endophytes
    • Leuchtmann, A., Schmidt, D., and L. P. Bush. 2000. Different levels of protective alkaloids in grasses with stroma-forming and seed-transmitted Epichloë/Neotyphodium endophytes. Journal of Chemical Ecology 26:1025-1036.
    • (2000) Journal of Chemical Ecology , vol.26 , pp. 1025-1036
    • Leuchtmann, A.1    Schmidt, D.2    Bush, L.P.3
  • 41
    • 0030774582 scopus 로고    scopus 로고
    • Occurrence of Acremonium endophytes in wild populations of Lolium spp. in European countries and a relationship between level of infection and climate in France
    • Lewis, G. C., Ravel, C., Naffaa, W., Astier, C., and G. Charmet. 1997. Occurrence of Acremonium endophytes in wild populations of Lolium spp. in European countries and a relationship between level of infection and climate in France. Annals of Applied Biology 130:227-238.
    • (1997) Annals of Applied Biology , vol.130 , pp. 227-238
    • Lewis, G.C.1    Ravel, C.2    Naffaa, W.3    Astier, C.4    Charmet, G.5
  • 42
    • 36248994216 scopus 로고    scopus 로고
    • Interactions of Neotyphodium gansuense, Achnatherum inebrians, and plant-pathogenic fungi
    • Li, C. J., Gao, J. H., and Z. B. Nan. 2007. Interactions of Neotyphodium gansuense, Achnatherum inebrians, and plant-pathogenic fungi. Mycological Research 111:1220-1227.
    • (2007) Mycological Research , vol.111 , pp. 1220-1227
    • Li, C.J.1    Gao, J.H.2    Nan, Z.B.3
  • 43
    • 0029659310 scopus 로고    scopus 로고
    • The evolution of virulence in pathogens with vertical and horizontal transmission
    • Lipsitch, M., Siller, S., and M. A. Nowak. 1996. The evolution of virulence in pathogens with vertical and horizontal transmission. Evolution 50:1729-1741.
    • (1996) Evolution , vol.50 , pp. 1729-1741
    • Lipsitch, M.1    Siller, S.2    Nowak, M.A.3
  • 44
    • 31044435606 scopus 로고    scopus 로고
    • Competitive coexistence of vertically and horizontally transmitted parasites
    • Lively, C. M., Clay, K., Wade, M. J., and C. Fuqua. 2005. Competitive coexistence of vertically and horizontally transmitted parasites. Evolutionary Ecology Research 7:1183-1190.
    • (2005) Evolutionary Ecology Research , vol.7 , pp. 1183-1190
    • Lively, C.M.1    Clay, K.2    Wade, M.J.3    Fuqua, C.4
  • 45
    • 0000712902 scopus 로고    scopus 로고
    • Danthonia spicata (Poaceae) and Atkinsonella hypoxylon (Balansiae): Environmental dependence of a symbiosis
    • McCormick, M. K., Gross, K. L., and R. A. Smith. 2001. Danthonia spicata (Poaceae) and Atkinsonella hypoxylon (Balansiae): Environmental dependence of a symbiosis. American Journal of Botany 88:903-909.
    • (2001) American Journal of Botany , vol.88 , pp. 903-909
    • McCormick, M.K.1    Gross, K.L.2    Smith, R.A.3
  • 46
    • 0021557847 scopus 로고
    • Grazing lawns: Animals in herds, plant form, and coevolution
    • McNaughton, S. J. 1984. Grazing lawns: Animals in herds, plant form, and coevolution. American Naturalist 124:863-886.
    • (1984) American Naturalist , vol.124 , pp. 863-886
    • McNaughton, S.J.1
  • 48
    • 38149085960 scopus 로고    scopus 로고
    • Breakdown of an ant-plant mutualism follows the loss of large herbivores from an African savanna
    • Palmer, T. M., Stanton, M. L., Young, T. P., Goheen, J. R., Pringle, R. M., and R. Karban. 2008. Breakdown of an ant-plant mutualism follows the loss of large herbivores from an African savanna. Science 319:192-195.
    • (2008) Science , vol.319 , pp. 192-195
    • Palmer, T.M.1    Stanton, M.L.2    Young, T.P.3    Goheen, J.R.4    Pringle, R.M.5    Karban, R.6
  • 49
    • 0042531727 scopus 로고    scopus 로고
    • Infection by the systemic fungus, Epichloë glyceriae, alters clonal growth of its grass host, Glyceria striata
    • Pan, J. J. and K. Clay. 2003. Infection by the systemic fungus, Epichloë glyceriae, alters clonal growth of its grass host, Glyceria striata. Proceedings of the Royal Society of London B 270:1585-1591.
    • (2003) Proceedings of the Royal Society of London B , vol.270 , pp. 1585-1591
    • Pan, J.J.1    Clay, K.2
  • 50
    • 44449124778 scopus 로고    scopus 로고
    • Relationship between the endophyte Embellisia spp. and the toxic alkaloid swainsonine in major locoweed species (Astragalus and Oxytropis)
    • Ralphs, M. H., Creamer, R., et al. 2008. Relationship between the endophyte Embellisia spp. and the toxic alkaloid swainsonine in major locoweed species (Astragalus and Oxytropis). Journal of Chemical Ecology 34:32-38.
    • (2008) Journal of Chemical Ecology , vol.34 , pp. 32-38
    • Ralphs, M.H.1    Creamer, R.2
  • 54
    • 33747775465 scopus 로고    scopus 로고
    • Model systems in ecology: Dissecting the endophyte-grass literature
    • Saikkonen, K., Lehtonen, P., et al. 2006. Model systems in ecology: Dissecting the endophyte-grass literature. Trends in Plant Science 11:428-433.
    • (2006) Trends in Plant Science , vol.11 , pp. 428-433
    • Saikkonen, K.1    Lehtonen, P.2
  • 55
    • 84980083394 scopus 로고
    • On the changes going on in the vegetation of South Africa
    • Shaw, J. 1873. On the changes going on in the vegetation of South Africa. Botanical Journal of the Linnean Society 14:202-208.
    • (1873) Botanical Journal of the Linnean Society , vol.14 , pp. 202-208
    • Shaw, J.1
  • 57
    • 34047104485 scopus 로고    scopus 로고
    • Phylogenetic evidence for an animal pathogen origin of ergot and the grass endophytes
    • Spatafora, J. W., Sung, G. H., et al. 2007. Phylogenetic evidence for an animal pathogen origin of ergot and the grass endophytes. Molecular Ecology 16:1701-1711.
    • (2007) Molecular Ecology , vol.16 , pp. 1701-1711
    • Spatafora, J.W.1    Sung, G.H.2
  • 58
    • 0034874945 scopus 로고    scopus 로고
    • Endophyte infection levels of native and naturalized fescues in Illinois and England
    • Spyreas, G., Gibson, D. J., and M. Basinger. 2001. Endophyte infection levels of native and naturalized fescues in Illinois and England. Journal of the Torrey Botanical Society 128:25-34.
    • (2001) Journal of the Torrey Botanical Society , vol.128 , pp. 25-34
    • Spyreas, G.1    Gibson, D.J.2    Basinger, M.3
  • 59
    • 17844405607 scopus 로고    scopus 로고
    • An empirical study of the evolution of virulence under both horizontal and vertical transmission
    • Stewart, A. D., Logsdon, J. M., and S. E. Kelley. 2005. An empirical study of the evolution of virulence under both horizontal and vertical transmission. Evolution 59:730-739.
    • (2005) Evolution , vol.59 , pp. 730-739
    • Stewart, A.D.1    Logsdon, J.M.2    Kelley, S.E.3
  • 62
    • 33645811480 scopus 로고    scopus 로고
    • Grass-herbivore interactions altered by strains of a native endophyte
    • Tintjer, T. and J. A. Rudgers. 2006. Grass-herbivore interactions altered by strains of a native endophyte. New Phytologist 170:513-521.
    • (2006) New Phytologist , vol.170 , pp. 513-521
    • Tintjer, T.1    Rudgers, J.A.2
  • 65
    • 0001003631 scopus 로고
    • Endophyte effects on growth and persistence of tall fescue along a water-supply gradient
    • West, C. P., Izekor, E., Turner, K. E., and A. A. Elmi. 1993. Endophyte effects on growth and persistence of tall fescue along a water-supply gradient. Agronomy Journal 85:264-270.
    • (1993) Agronomy Journal , vol.85 , pp. 264-270
    • West, C.P.1    Izekor, E.2    Turner, K.E.3    Elmi, A.A.4
  • 66
    • 0024947834 scopus 로고
    • Why are secondary metabolites (natural-products) biosynthesized
    • Williams, D. H., Stone, M. J., et al. 1989. Why are secondary metabolites (natural-products) biosynthesized. Journal of Natural Products 52:1189-1208.
    • (1989) Journal of Natural Products , vol.52 , pp. 1189-1208
    • Williams, D.H.1    Stone, M.J.2


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