@article{IM2_1975_9_6_a9,
     author = {S. A. Pirogov},
     title = {The existence of lattice models with several types of pariticles},
     journal = {Izvestiya. Mathematics },
     pages = {1333--1357},
     publisher = {mathdoc},
     volume = {9},
     number = {6},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1975_9_6_a9/}
}