%0 Journal Article %A Ilya D. Ivantsov %A Sergey G. Ovchinnikov %T Cluster perturbation theory for 2d Ising model %J Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika %D 2015 %P 31-37 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/JSFU_2015_8_1_a4/ %G en %F JSFU_2015_8_1_a4