@article{01180640, title = {Necessary and sufficient conditions for the oscillation of delay differential equations with a piecewise constant argument.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {21}, year = {1998}, pages = {493-497}, doi = {10.1155/S0161171298000702}, zbl = {0904.34052}, language = {en}, url = {http://dml.mathdoc.fr/item/01180640} }
Agwo, H.A. Necessary and sufficient conditions for the oscillation of delay differential equations with a piecewise constant argument.. International Journal of Mathematics and Mathematical Sciences, Tome 21 (1998) pp. 493-497. doi : 10.1155/S0161171298000702. http://gdmltest.u-ga.fr/item/01180640/