@article{VMUMM_2016_2_a0,
     author = {A. I. Zhila},
     title = {Chaplygin{\textquoteright}s ball with a rotor: {Non-degeneracy} of singular points},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--12},
     publisher = {mathdoc},
     number = {2},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2016_2_a0/}
}