@article{01331822, title = {Oscillatory behaviour of solutions of two-dimensional differential systems with deviated arguments.}, journal = {Georgian Mathematical Journal}, volume = {6}, year = {1999}, pages = {335-346}, doi = {10.1023/A:1022913632464}, zbl = {0928.34048}, language = {en}, url = {http://dml.mathdoc.fr/item/01331822} }
Koplatadze, R.; Partsvania, N. Oscillatory behaviour of solutions of two-dimensional differential systems with deviated arguments.. Georgian Mathematical Journal, Tome 6 (1999) pp. 335-346. doi : 10.1023/A:1022913632464. http://gdmltest.u-ga.fr/item/01331822/