@article{DAN_1991_317_6_a2,
     author = {V. I. Zubov},
     title = {The structure of a topological transformation defined by a system},
     journal = {Doklady Akademii Nauk},
     pages = {1298--1303},
     year = {1991},
     volume = {317},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1991_317_6_a2/}
}