@article{CMUC_1989__30_4_a8,
     author = {Grace, Said R. and Lalli, Bikkar S.},
     title = {Oscillation theorems for nonlinear second order differential equations with a damping term},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {691--697},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {1989},
     mrnumber = {1045897},
     zbl = {0692.34030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a8/}
}