@article{JSFU_2015_8_1_a4,
     author = {Ilya D. Ivantsov and Sergey G. Ovchinnikov},
     title = {Cluster perturbation theory for 2d {Ising} model},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
     pages = {31--37},
     publisher = {mathdoc},
     volume = {8},
     number = {1},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2015_8_1_a4/}
}