@article{MAN_1897__49_157850,
     author = {Paul St\"ackel and Friedrich Engel},
     title = {Biegungen und conjugirte {Systeme}},
     journal = {Mathematische Annalen},
     pages = {255--310},
     year = {1897},
     volume = {49},
     zbl = {28.0548.04},
     url = {http://geodesic.mathdoc.fr/item/MAN_1897__49_157850/}
}