@article{03800119, title = {Nonlinear oscillations in disconjugate forced functional equations with deviating arguments.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {6}, year = {1983}, pages = {101-109}, doi = {10.1155/S0161171283000083}, zbl = {0507.34058}, language = {en}, url = {http://dml.mathdoc.fr/item/03800119} }
Singh, Bhagat. Nonlinear oscillations in disconjugate forced functional equations with deviating arguments.. International Journal of Mathematics and Mathematical Sciences, Tome 6 (1983) pp. 101-109. doi : 10.1155/S0161171283000083. http://gdmltest.u-ga.fr/item/03800119/