Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1971_7_6_a5, author = {K. K. Kammatov}, title = {Oscillations in certain essentially nonlinear systems}, journal = {Differencialʹnye uravneni\^a}, pages = {997--1006}, publisher = {mathdoc}, volume = {7}, number = {6}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_6_a5/} }
K. K. Kammatov. Oscillations in certain essentially nonlinear systems. Differencialʹnye uravneniâ, Tome 7 (1971) no. 6, pp. 997-1006. http://geodesic.mathdoc.fr/item/DE_1971_7_6_a5/