@article{VMUMM_2014_4_a1,
     author = {E. O. Kantonistova},
     title = {Integer lattices of action-angle variables for {\textquotedblleft}spherical pendulum{\textquotedblright} system},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {6--17},
     year = {2014},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2014_4_a1/}
}