@article{MAN_1924__92_159055,
     author = {Iv. Tz\'enoff},
     title = {Sur les percussions appliqu\'ees aux syst\`emes mat\'eriels.},
     journal = {Mathematische Annalen},
     pages = {42--57},
     publisher = {mathdoc},
     volume = {92},
     year = {1924},
     zbl = {50.0529.04},
     url = {http://geodesic.mathdoc.fr/item/MAN_1924__92_159055/}
}