@article{MMO_1972_26_a5,
     author = {N. N. Nehoro\v{s}ev},
     title = {Action-angle variables, and their generalizations},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {181--198},
     publisher = {mathdoc},
     volume = {26},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1972_26_a5/}
}