@article{VMUMM_1991_5_a19,
     author = {I. I. Chigur},
     title = {On the stability of periodic motions of a rigid body between walls},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {89--92},
     year = {1991},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1991_5_a19/}
}