@article{00005064, title = {Strong oscillations for second order nonlinear functional differential equations.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {13}, year = {1990}, pages = {151-158}, doi = {10.1155/S0161171290000205}, zbl = {0755.34067}, language = {en}, url = {http://dml.mathdoc.fr/item/00005064} }
Yan, Jurang. Strong oscillations for second order nonlinear functional differential equations.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 151-158. doi : 10.1155/S0161171290000205. http://gdmltest.u-ga.fr/item/00005064/