@article{DA_2005_12_1_a2,
     author = {S. A. Puzynina},
     title = {Perfect colorings of vertices of the graph $G(Z^2)$ in three colors},
     journal = {Diskretnyj analiz i issledovanie operacij},
     pages = {37--54},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DA_2005_12_1_a2/}
}