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@article{ARM_1977__13_4_a2, author = {Mehri, B.}, title = {A note on periodic solution of second order non-linear differential equations}, journal = {Archivum mathematicum}, pages = {191--194}, publisher = {mathdoc}, volume = {13}, number = {4}, year = {1977}, mrnumber = {0477244}, zbl = {0394.34034}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1977__13_4_a2/} }
Mehri, B. A note on periodic solution of second order non-linear differential equations. Archivum mathematicum, Tome 13 (1977) no. 4, pp. 191-194. http://geodesic.mathdoc.fr/item/ARM_1977__13_4_a2/