@article{120253, author = {J\'an Andres}, title = {Periodic solutions of the third-order differential equation with right-hand side in the form of nonlinear restoring term plus general gradient-like part}, journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica}, volume = {30}, year = {1991}, pages = {143-148}, zbl = {0777.34029}, mrnumber = {1166433}, language = {en}, url = {http://dml.mathdoc.fr/item/120253} }
Andres, Ján. Periodic solutions of the third-order differential equation with right-hand side in the form of nonlinear restoring term plus general gradient-like part. Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, Tome 30 (1991) pp. 143-148. http://gdmltest.u-ga.fr/item/120253/
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