@article{MAN_1929__101_159333,
     author = {R. Rothe},
     title = {\"Uber dreifach-orthogonale {Fl\"achensysteme}},
     journal = {Mathematische Annalen},
     pages = {273--283},
     publisher = {mathdoc},
     volume = {101},
     year = {1929},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1929__101_159333/}
}