@article{SMJ2_2005_31_4_a1,
     author = {Elabbasy, E. and Hassan, T. and Saker, S.},
     title = {Necessary and {Sufficient} {Condition} for {Oscillations} of {Neutral} {Differential} {Equation}},
     journal = {Serdica Mathematical Journal},
     pages = {279--290},
     publisher = {mathdoc},
     volume = {31},
     number = {4},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2005_31_4_a1/}
}