@article{VMUMM_1989_1_a11,
     author = {A. Ya. Sagomonyan and Ya. P. Dvorkin},
     title = {Penetrating an obstacle by a normal impact of a deformable truncated cone},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {54--60},
     publisher = {mathdoc},
     number = {1},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1989_1_a11/}
}