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@article{MAN_1907__63_158301, author = {Erich Mosch}, title = {\"Uber {Fl\"achenscharen,} deren orthogonale {Trajektorien} ebene {Kurven} sind}, journal = {Mathematische Annalen}, pages = {573--590}, publisher = {mathdoc}, volume = {63}, year = {1907}, zbl = {38.0640.02}, url = {http://geodesic.mathdoc.fr/item/MAN_1907__63_158301/} }
Erich Mosch. Über Flächenscharen, deren orthogonale Trajektorien ebene Kurven sind. Mathematische Annalen, Tome 63 (1907), pp. 573-590. http://geodesic.mathdoc.fr/item/MAN_1907__63_158301/