@article{TMF_2010_162_2_a3,
     author = {A. S. Ovchinnikov and I. G. Bostrem and Vl. E. Sinitsyn},
     title = {Cluster perturbation theory for spin {Hamiltonians}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {216--226},
     publisher = {mathdoc},
     volume = {162},
     number = {2},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2010_162_2_a3/}
}