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@article{MASLO_1992__42_2_a7, author = {Ol\'ah, Rudolf}, title = {On positive solutions of nonlinear retarded differential equations}, journal = {Mathematica slovaca}, pages = {201--210}, publisher = {mathdoc}, volume = {42}, number = {2}, year = {1992}, mrnumber = {1170104}, zbl = {0756.34070}, language = {en}, url = {http://geodesic.mathdoc.fr/item/MASLO_1992__42_2_a7/} }
Oláh, Rudolf. On positive solutions of nonlinear retarded differential equations. Mathematica slovaca, Tome 42 (1992) no. 2, pp. 201-210. http://geodesic.mathdoc.fr/item/MASLO_1992__42_2_a7/