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@article{DE_1979_15_6_a1, author = {S. V. Zubov}, title = {The stability of periodic motion}, journal = {Differencialʹnye uravneni\^a}, pages = {974--979}, publisher = {mathdoc}, volume = {15}, number = {6}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1979_15_6_a1/} }
S. V. Zubov. The stability of periodic motion. Differencialʹnye uravneniâ, Tome 15 (1979) no. 6, pp. 974-979. http://geodesic.mathdoc.fr/item/DE_1979_15_6_a1/