@article{04017423, title = {Oscillation theorems for second order nonlinear differential equations with deviating arguments.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {10}, year = {1987}, pages = {35-45}, doi = {10.1155/S0161171287000048}, zbl = {0626.34075}, language = {en}, url = {http://dml.mathdoc.fr/item/04017423} }
Grace, S.R.; Lalli, B.S. Oscillation theorems for second order nonlinear differential equations with deviating arguments.. International Journal of Mathematics and Mathematical Sciences, Tome 10 (1987) pp. 35-45. doi : 10.1155/S0161171287000048. http://gdmltest.u-ga.fr/item/04017423/