@article{IVM_2010_8_a4,
     author = {V. D. Irtegov},
     title = {Specific features of families of invariant manifolds of conservative systems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {42--50},
     publisher = {mathdoc},
     number = {8},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2010_8_a4/}
}