@article{VMUMM_2012_5_a6,
     author = {T. F. Barbashova and L. S. Otradnova},
     title = {Motion of a sphere colliding with a rough surface},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {35--39},
     publisher = {mathdoc},
     number = {5},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2012_5_a6/}
}