%0 Journal Article %A V. S. Kapitonov %T Functional representation of the partition function and phase transitions in the Hubbard model %J Zapiski Nauchnykh Seminarov POMI %D 1994 %P 102-120 %V 209 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1994_209_a5/ %G ru %F ZNSL_1994_209_a5