@article{00940797, title = {Oscillatory criteria for nonlinear }, journal = {Georgian Mathematical Journal}, volume = {3}, year = {1996}, pages = {301-314}, doi = {10.1007/BF02256721}, zbl = {0857.34038}, language = {en}, url = {http://dml.mathdoc.fr/item/00940797} }
Bartušek, Miroslav. Oscillatory criteria for nonlinear . Georgian Mathematical Journal, Tome 3 (1996) pp. 301-314. doi : 10.1007/BF02256721. http://gdmltest.u-ga.fr/item/00940797/