@article{VMUMM_1997_4_a8,
     author = {P. V. Anikeyev},
     title = {On symmetry fields of second degree in the momenta of geodesic flows on a two-dimensional sphere},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {29--32},
     publisher = {mathdoc},
     number = {4},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1997_4_a8/}
}