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@article{PIM_1979_N_S_25_39_a32, author = {Cheh-Chih Yeh}, title = {Nonoscillation {Of} {Nonlinear} {Retarded} {Differential} {Equations}}, journal = {Publications de l'Institut Math\'ematique}, pages = {240 }, publisher = {mathdoc}, volume = {_N_S_25}, number = {39}, year = {1979}, url = {http://geodesic.mathdoc.fr/item/PIM_1979_N_S_25_39_a32/} }
Cheh-Chih Yeh. Nonoscillation Of Nonlinear Retarded Differential Equations. Publications de l'Institut Mathématique, _N_S_25 (1979) no. 39, p. 240 . http://geodesic.mathdoc.fr/item/PIM_1979_N_S_25_39_a32/