@article{DE_1981_17_8_a12,
     author = {E. Z. Borevich},
     title = {Conditions for topological equivalence of two-dimensional {Morse--Smale} diffeomorphisms},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1481--1482},
     publisher = {mathdoc},
     volume = {17},
     number = {8},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_8_a12/}
}