@article{IVM_1989_9_a13,
     author = {E. Z. Borevich},
     title = {Two-dimensional {Morse--Smale} diffeomorphisms that have oriented heteroclinic connections},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {77--79},
     publisher = {mathdoc},
     number = {9},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1989_9_a13/}
}