@article{GDZPPN00203476X, title = {On second order sublinear oscillation.}, journal = {Aequationes mathematicae}, volume = {27}, year = {1984}, pages = {242-254}, zbl = {0545.34026}, url = {http://dml.mathdoc.fr/item/GDZPPN00203476X} }
Philos, Ch. G. On second order sublinear oscillation.. Aequationes mathematicae, Tome 27 (1984) pp. 242-254. http://gdmltest.u-ga.fr/item/GDZPPN00203476X/