@article{TMF_1989_79_3_a11,
     author = {A. A. Zaitsev},
     title = {Variational method of~calculating the partition functions of~the lattice-gas and {Ising} models},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {437--445},
     publisher = {mathdoc},
     volume = {79},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1989_79_3_a11/}
}