@article{PORMA_2003__60_3_51166,
     author = {Saker, S.H.},
     title = {Oscillation of solutions of a pair of coupled nonlinear delay differential equations.},
     journal = {Portugaliae mathematica},
     pages = {319--336},
     publisher = {mathdoc},
     volume = {60},
     number = {3},
     year = {2003},
     zbl = {1057.34082},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2003__60_3_51166/}
}