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@article{MAN_1954__127_160387, author = {H. Wittich}, title = {Zur {Theorie} der {Riccatischen} {Differentialgleichung.}}, journal = {Mathematische Annalen}, pages = {433--440}, publisher = {mathdoc}, volume = {127}, year = {1954}, zbl = {0055.08005}, url = {http://geodesic.mathdoc.fr/item/MAN_1954__127_160387/} }
H. Wittich. Zur Theorie der Riccatischen Differentialgleichung.. Mathematische Annalen, Tome 127 (1954), pp. 433-440. http://geodesic.mathdoc.fr/item/MAN_1954__127_160387/