@article{GDZPPN002477009, title = {Stability Properties of (r(t)u')' + a(t) f(u) g(u') = 0.}, journal = {Monatshefte f\"ur Mathematik}, volume = {74}, year = {1970}, pages = {211-222}, zbl = {0195.09804}, url = {http://dml.mathdoc.fr/item/GDZPPN002477009} }
Burton, T.A.; Grimmer, R.C. Stability Properties of (r(t)u')' + a(t) f(u) g(u') = 0.. Monatshefte für Mathematik, Tome 74 (1970) pp. 211-222. http://gdmltest.u-ga.fr/item/GDZPPN002477009/