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After completion of this work we have been aware of quantum Monte Carlo computations for the (Formula presented) model with values of (Formula presented) in the range considered in this paper and (Formula presented) up to (Formula presented), by T. Husslein, I. Morgenstern, D. M. Newns, P. C. Pattnaik, J. M. Singer, and H. G. Matuttis, Phys. Rev. B54, 16 179 (1996). For filling levels where the Fermi energy lies close to the van Hove singularity, a pairing tendency in the (Formula presented) symmetry channel is found by these authors.
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