@article{GMJ_2000__7_2_48682,
     author = {Agarwal, Ravi P. and Grace, S.R.},
     title = {On the oscillation of certain second-order differential equations.},
     journal = {Georgian Mathematical Journal},
     pages = {201--213},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2000},
     zbl = {0958.34027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/GMJ_2000__7_2_48682/}
}