@article{MAN_1901__54_157995,
     author = {Paul St\"ackel},
     title = {Ueber die {Gestalt} der {Bahncurven} bei einer {Klasse} dynamischer {Probleme}},
     journal = {Mathematische Annalen},
     pages = {86--90},
     publisher = {mathdoc},
     volume = {54},
     year = {1901},
     zbl = {31.0698.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1901__54_157995/}
}