@article{MAN_1924__91_159044,
     author = {I. Tz\'enoff},
     title = {Sur les \'equations du mouvement des syst\`emes mat\'eriels non holonomes},
     journal = {Mathematische Annalen},
     pages = {161--168},
     publisher = {mathdoc},
     volume = {91},
     year = {1924},
     zbl = {50.0529.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1924__91_159044/}
}