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@article{MZ_1959__71_169813, author = {Wolfgang Walter}, title = {\"Uber die {Differentialgleichung} u... = f (x, y, u, u..., u...).}, journal = {Mathematische Zeitschrift}, pages = {308--324}, publisher = {mathdoc}, volume = {71}, year = {1959}, language = {de}, url = {http://geodesic.mathdoc.fr/item/MZ_1959__71_169813/} }
Wolfgang Walter. Über die Differentialgleichung u... = f (x, y, u, u..., u...).. Mathematische Zeitschrift, Tome 71 (1959), pp. 308-324. http://geodesic.mathdoc.fr/item/MZ_1959__71_169813/