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@article{ARM_1969__5_4_a1, author = {Lorch, Lee}, title = {Two elementary remarks on non-linear differential equations of the second order}, journal = {Archivum mathematicum}, pages = {173--175}, publisher = {mathdoc}, volume = {05}, number = {4}, year = {1969}, mrnumber = {0277818}, zbl = {0242.34033}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1969__5_4_a1/} }
Lorch, Lee. Two elementary remarks on non-linear differential equations of the second order. Archivum mathematicum, Tome 05 (1969) no. 4, pp. 173-175. http://geodesic.mathdoc.fr/item/ARM_1969__5_4_a1/