@article{GDZPPN002477629, title = {Second Order Nonlinear Oscillation - Deviating Arguments.}, journal = {Monatshefte f\"ur Mathematik}, volume = {75}, year = {1971}, pages = {341-345}, zbl = {0204.40802}, url = {http://dml.mathdoc.fr/item/GDZPPN002477629} }
Teufel, Hugo, Jr. Second Order Nonlinear Oscillation - Deviating Arguments.. Monatshefte für Mathematik, Tome 75 (1971) pp. 341-345. http://gdmltest.u-ga.fr/item/GDZPPN002477629/