@article{MAN_1877__11_156756,
     author = {Schubert},
     title = {Tangentensingularit\"aten der allgemeinen {Ordnungsfl\"ache}},
     journal = {Mathematische Annalen},
     pages = {347--378},
     publisher = {mathdoc},
     volume = {11},
     year = {1877},
     zbl = {09.0457.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1877__11_156756/}
}