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@article{DE_1970_6_3_a7, author = {V. S. Medvedev}, title = {Sufficient conditions for the absence of integral cycles for dynamical systems on manifolds}, journal = {Differencialʹnye uravneni\^a}, pages = {454--466}, publisher = {mathdoc}, volume = {6}, number = {3}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1970_6_3_a7/} }
V. S. Medvedev. Sufficient conditions for the absence of integral cycles for dynamical systems on manifolds. Differencialʹnye uravneniâ, Tome 6 (1970) no. 3, pp. 454-466. http://geodesic.mathdoc.fr/item/DE_1970_6_3_a7/