@article{DMDICO_2003_23_1_a3,
     author = {Elabbasy, E. and Saker, S.},
     title = {Oscillation of delay differential equation with several positive and negative coefficients},
     journal = {Discussiones Mathematicae. Differential Inclusions, Control and Optimization},
     pages = {39--52},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {2003},
     zbl = {1060.34035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMDICO_2003_23_1_a3/}
}