@article{05695235, title = {Existence and uniqueness of periodic solutions for a second-order nonlinear differential equation with piecewise constant argument.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {2009}, year = {2009}, doi = {10.1155/2009/950797}, zbl = {1193.34145}, language = {en}, url = {http://dml.mathdoc.fr/item/05695235} }
Wang, Gen-Qiang; Cheng, Sui Sun. Existence and uniqueness of periodic solutions for a second-order nonlinear differential equation with piecewise constant argument.. International Journal of Mathematics and Mathematical Sciences, Tome 2009 (2009) . doi : 10.1155/2009/950797. http://gdmltest.u-ga.fr/item/05695235/