@article{IVM_1976_12_a2,
     author = {A. S. Gurtovnik and Yu. I. Neimark},
     title = {Invariant manifolds of certain point mappings},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {21--29},
     publisher = {mathdoc},
     number = {12},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_12_a2/}
}