%0 Journal Article %A S. A. Pirogov %T Gibbs random fields, and the problem of the coexistence of phases for lattice models of statistical physics %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1975 %V 30 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1975_30_2_a17/ %G ru %F RM_1975_30_2_a17