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- [5] SU(2) SUPERCONDUCTIVITY IN THE NEGATIVE-U HUBBARD-MODEL PHYSICAL REVIEW B, 1993, 48 (17): : 12917 - 12920
- [9] VARIATIONAL APPROACHES TO THE NEGATIVE-U HUBBARD-MODEL FOR ARBITRARY BANDFILLINGS ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1993, 92 (02): : 173 - 178
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