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@article{MZM_1970_7_6_a1, author = {L. S. Mel'nikov}, title = {The chromatic class and the location of a graph on a closed surface}, journal = {Matemati\v{c}eskie zametki}, pages = {671--682}, publisher = {mathdoc}, volume = {7}, number = {6}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a1/} }
L. S. Mel'nikov. The chromatic class and the location of a graph on a closed surface. Matematičeskie zametki, Tome 7 (1970) no. 6, pp. 671-682. http://geodesic.mathdoc.fr/item/MZM_1970_7_6_a1/