@article{MAN_1925__93_159088,
     author = {Petri.K.},
     title = {\"Uber {Spezialkurven.} {I.}},
     journal = {Mathematische Annalen},
     pages = {182--209},
     publisher = {mathdoc},
     volume = {93},
     year = {1925},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1925__93_159088/}
}