@article{05816434, title = {Oscillation theorems for second-order damped nonlinear differential equations.}, journal = {International Journal of Differential Equations}, volume = {2009}, year = {2009}, doi = {10.1155/2009/714357}, zbl = {1207.34083}, language = {en}, url = {http://dml.mathdoc.fr/item/05816434} }
Qin, Hui-Zeng; Ren, Yongsheng. Oscillation theorems for second-order damped nonlinear differential equations.. International Journal of Differential Equations, Tome 2009 (2009) . doi : 10.1155/2009/714357. http://gdmltest.u-ga.fr/item/05816434/