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Distasio, M and Ercolessi, E and Morandi, G and RIGHI R, R and Tagliacozzo, A and Zucchelli, GP (1994) Effective action and adiabatic expansions for the 1-D and 2-D hubbard models at half-filling. In: International journal of modern physics B, 8 (10). 1391 -1416 .