@article{VMUMM_2007_6_a13,
     author = {M. Yu. Ivochkin},
     title = {Critical invariant sets for the {Goryachev--Chaplygin} gyrostat},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {66--68},
     publisher = {mathdoc},
     number = {6},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2007_6_a13/}
}