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@article{AM2_1984__27_137028, author = {Ch. G. Philos}, title = {On second order sublinear oscillation.}, journal = {Aequationes mathematicae}, pages = {242--254}, publisher = {mathdoc}, volume = {27}, year = {1984}, zbl = {0545.34026}, url = {http://geodesic.mathdoc.fr/item/AM2_1984__27_137028/} }
Ch. G. Philos. On second order sublinear oscillation.. Aequationes mathematicae, Tome 27 (1984), pp. 242-254. http://geodesic.mathdoc.fr/item/AM2_1984__27_137028/