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- [6] FUNCTIONAL INTEGRAL APPROACH FOR HUBBARD-MODEL WITH ARBITRARY ELECTRON-DENSITY PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1978, 88 (01): : 189 - 198
- [9] SUPERCONDUCTIVITY IN THE EXTENDED HUBBARD-MODEL PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1991, 163 (01): : 197 - 209
- [10] STRONG ELECTRONIC CORRELATIONS IN MAGNETIC SEMICONDUCTORS - THE FUNCTIONAL INTEGRAL APPROACH TO THE HUBBARD-MODEL ACTA POLYTECHNICA SCANDINAVICA-ELECTRICAL ENGINEERING SERIES, 1983, (50): : 139 - 182