@article{03708820, title = {Oscillation in second order functional equations with deviating arguments.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {4}, year = {1981}, pages = {137-146}, doi = {10.1155/S0161171281000094}, zbl = {0453.34058}, language = {en}, url = {http://dml.mathdoc.fr/item/03708820} }
Singh, Bhagat. Oscillation in second order functional equations with deviating arguments.. International Journal of Mathematics and Mathematical Sciences, Tome 4 (1981) pp. 137-146. doi : 10.1155/S0161171281000094. http://gdmltest.u-ga.fr/item/03708820/