On forced periodic oscillations in dissipative Liénard systems
Rendiconti del Seminario Matematico della Università di Padova, Tome 69 (1983), pp. 51-62. 
@article{RSMUP_1983__69__51_0,
     author = {Zanolin, Fabio},
     title = {On forced periodic oscillations in dissipative {Li\'enard} systems},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {51--62},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {69},
     year = {1983},
     mrnumber = {716985},
     zbl = {0522.34041},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1983__69__51_0/}
}
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Zanolin, Fabio. On forced periodic oscillations in dissipative Liénard systems. Rendiconti del Seminario Matematico della Università di Padova, Tome 69 (1983), pp. 51-62. http://www.numdam.org/item/RSMUP_1983__69__51_0/

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