@article{105984, author = {Pavel Dr\'abek}, title = {Remarks on multiple periodic solutions of nonlinear ordinary differential equations}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {021}, year = {1980}, pages = {155-160}, zbl = {0425.34042}, mrnumber = {566247}, language = {en}, url = {http://dml.mathdoc.fr/item/105984} }
Drábek, Pavel. Remarks on multiple periodic solutions of nonlinear ordinary differential equations. Commentationes Mathematicae Universitatis Carolinae, Tome 021 (1980) pp. 155-160. http://gdmltest.u-ga.fr/item/105984/
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