%0 Journal Article %A V. A. Kapustin %T On~an~effective Hamiltonian that describes quasihomeopolar excitations in the framework of the Hubbard model %J Teoretičeskaâ i matematičeskaâ fizika %D 1974 %P 118-129 %V 21 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1974_21_1_a10/ %G ru %F TMF_1974_21_1_a10