@article{RSMUP_1984__72__203_0, author = {Omari, Pierpaolo and Zanolin, Fabio}, title = {Periodic solutions of Li\'enard equations}, journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova}, volume = {72}, year = {1984}, pages = {203-230}, mrnumber = {778342}, zbl = {0584.34045}, language = {en}, url = {http://dml.mathdoc.fr/item/RSMUP_1984__72__203_0} }
Omari, Pierpaolo; Zanolin, Fabio. Periodic solutions of Liénard equations. Rendiconti del Seminario Matematico della Università di Padova, Tome 72 (1984) pp. 203-230. http://gdmltest.u-ga.fr/item/RSMUP_1984__72__203_0/
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