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@article{MMO_1957_6_a1, author = {L. A. Skornyakov}, title = {Systems of curves on a surface}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {135--164}, publisher = {mathdoc}, volume = {6}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1957_6_a1/} }
L. A. Skornyakov. Systems of curves on a surface. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 6 (1957), pp. 135-164. http://geodesic.mathdoc.fr/item/MMO_1957_6_a1/