@article{DAN_1980_254_2_a11,
     author = {M. L. Lidov},
     title = {Generating functions of symplectic mappings},
     journal = {Doklady Akademii Nauk},
     pages = {308--312},
     year = {1980},
     volume = {254},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_254_2_a11/}
}