@article{VMUMM_2006_6_a12,
     author = {R. V. Avros and V. V. Beletskii},
     title = {On three classes of simply periodic trajectories in the problem of the motion of a rigid body about a fixed point in the case ${\CYRA}=B=0{,}5C$},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {53--57},
     publisher = {mathdoc},
     number = {6},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2006_6_a12/}
}