@article{SMJ2_1997_23_3-4_a5,
     author = {Elabbasy, E.},
     title = {Oscillation {Theorems} for {Second} {Order} {Sublinear} {Ordinary} {Differential} {Equations}},
     journal = {Serdica Mathematical Journal},
     pages = {243--254},
     publisher = {mathdoc},
     volume = {23},
     number = {3-4},
     year = {1997},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_1997_23_3-4_a5/}
}