@article{MAN_1924__92_159054,
     author = {G. Hamel},
     title = {\"Uber nichtholonome {Systeme}},
     journal = {Mathematische Annalen},
     pages = {33--41},
     publisher = {mathdoc},
     volume = {92},
     year = {1924},
     zbl = {50.0529.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1924__92_159054/}
}