@article{DAN_1978_242_2_a5,
     author = {S. A. Pirogov},
     title = {Phase diagrams of quantum lattice systems},
     journal = {Doklady Akademii Nauk},
     pages = {284--286},
     publisher = {mathdoc},
     volume = {242},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1978_242_2_a5/}
}