@article{TDM_2004_8_a16,
     author = {V. G. Smirnov},
     title = {Construction methods of solutions graphs for systems of $k$-valued equations},
     journal = {Trudy po diskretnoj matematike},
     pages = {253--280},
     year = {2004},
     volume = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TDM_2004_8_a16/}
}