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The effect of two cycles on the complexity of colourings by digraphs
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J. BANG-JANSEN and P. HELL. The effect of two cycles on the complexity of colourings by digraphs. Discrete Applied Math. 26 (1990), 1-23.
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On the complexity of colouring by superdigraphs of bipartite graphs
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J. BANG-JANSEN, P. HELL and G. MACGILLIVRAY. On the complexity of colouring by superdigraphs of bipartite graphs. Discrete Math., to appear.
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Discrete Math.
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W. GUTJAHR. Graph colorings (Ph.D. Thesis, Free University, Berlin, 1991).
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Higman, C.1
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An introduction to the category of graphs
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P. HELL. An introduction to the category of graphs. Annals of the N.Y. Acad. Sc. 328 (1979), 120-136.
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Hell, P.1
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On the complexity of H-coloring
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P. HELL and J. NEŠETŘIL. On the complexity of H-coloring. J. Combin. Th. (B) 48 (1990), 92-110.
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Hell, P.1
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Homomorphisms of graphs and their orientations
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P. HELL and J. NEŠETŘIL. Homomorphisms of graphs and their orientations. Monatshefte für Math. 85 (1978), 39-48.
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Monatshefte für Math.
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Hell, P.1
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The core of a graph
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P. HELL and J. NEŠETŘIL. The core of a graph. Discrete Math. 109 (1992), 117-126.
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Discrete Math.
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Duality of graph homomorphisms
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Bolyai Society Mathematical Studies, Budapest
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P. HELL, J. NEŠETŘIL and X. ZHU. Duality of graph homomorphisms; in Combinatorics, Paul Erdös is Eighty, Vol. 2 (Bolyai Society Mathematical Studies, Budapest, 1994).
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The existence of homomorphisms to oriented cycles
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P. HELL, and X. ZHU. The existence of homomorphisms to oriented cycles. SIAM J. on Disc. Math., to appear.
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SIAM J. on Disc. Math.
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Hell, P.1
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Homomorphisms to oriented paths
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P. HELL, and X. ZHU. Homomorphisms to oriented paths. Discrete Math., 132 (1994), 107-114.
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Homomorphisms to oriented cycles
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P. HELL, H. ZHOU and X. ZHU. Homomorphisms to oriented cycles. Combinatorica 13 (1993), 421-433.
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Combinatorica
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Hell, P.1
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22
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Multiplicativity of oriented cycles
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P. HELL, H. ZHOU and X. ZHU. Multiplicativity of oriented cycles. J. Comb. Th. (B) 60 (1994), 239-253.
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J. Comb. Th. (B)
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Hell, P.1
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23
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Some new good characterizations of directed graphs
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P. KOMÁREK. Some new good characterizations of directed graphs. Časopis Pěst. Mat. 51 (1984), 348-354.
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On classes of relations and graphs determined by subobjects and factorobjects
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J. NEŠETŘIL and A PULTR. On classes of relations and graphs determined by subobjects and factorobjects. Discrete Math. 22 (1978), 287-300.
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Nešetřil, J.1
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Symmetric graphs and interpretations
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E. WELZL. Symmetric graphs and interpretations. J. Combin. Th. (B) 37 (1984), 235-244.
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A polynomial algorithm for homomorphisms to oriented cycles
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X. ZHU. A polynomial algorithm for homomorphisms to oriented cycles. J. Algorithms (to appear).
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J. Algorithms
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