@article{00968631, title = {On oscillation of solutions of second-order systems of deviated differential equations.}, journal = {Georgian Mathematical Journal}, volume = {3}, year = {1996}, pages = {571-582}, doi = {10.1007/BF02259985}, zbl = {0868.34054}, language = {en}, url = {http://dml.mathdoc.fr/item/00968631} }
Partsvania, N. On oscillation of solutions of second-order systems of deviated differential equations.. Georgian Mathematical Journal, Tome 3 (1996) pp. 571-582. doi : 10.1007/BF02259985. http://gdmltest.u-ga.fr/item/00968631/