Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1973_9_7_a1, author = {Ya. V. Bykov and K. A. Kiriy}, title = {Periodic oscillations with large {amplitude.~II}}, journal = {Differencialʹnye uravneni\^a}, pages = {1177--1186}, publisher = {mathdoc}, volume = {9}, number = {7}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1973_9_7_a1/} }
Ya. V. Bykov; K. A. Kiriy. Periodic oscillations with large amplitude.~II. Differencialʹnye uravneniâ, Tome 9 (1973) no. 7, pp. 1177-1186. http://geodesic.mathdoc.fr/item/DE_1973_9_7_a1/