@article{DAN_1974_214_6_a9,
     author = {S. A. Pirogov},
     title = {Phase transitions of the first kind for spin models with a spin that assumes the values $-1$, $0$, $1$},
     journal = {Doklady Akademii Nauk},
     pages = {1273--1275},
     publisher = {mathdoc},
     volume = {214},
     number = {6},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_214_6_a9/}
}