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@article{IVM_1982_3_a4, author = {V. A. Molchanov}, title = {Semigroups of graph colorings}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {26--33}, publisher = {mathdoc}, number = {3}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1982_3_a4/} }
V. A. Molchanov. Semigroups of graph colorings. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1982), pp. 26-33. http://geodesic.mathdoc.fr/item/IVM_1982_3_a4/