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Morgenstern, Ingo and Fettes, Werner and Husslein, Thomas and Matuttis, H. G. and Singer, Johannes Maria and Baur, C. (1995) Density of States in the -Hubbard Model: Exact Diagonalisation Results. Journal de Physique I 5 (4), pp. 455-464.
Husslein, Thomas and Newns, Dennis M. and Matuttis, H. G. and Pattnaik, Pratap C. and Morgenstern, Ingo and Singer, Johannes Maria and Fettes, Werner and Baur, C. (1994) Spin-spin correlations in the tt'-Hubbard model. Journal de Physique 1 4 (11), pp. 1573-1576.