1. Andronov AA, Pontryagin LS. Rough systems: report. Acad Sci USSR 1937; 14:5:247–250.
2. Bezdenezhnyh AN. Dissertation: Topological classification of Morse-Smale diffeomorphisms with orientable heteroclinic set on two-dimensional manifolds. Gor’kij: The University of N.I. Lobachevskiy; 1985.
3. Bezdenezhnykh AN, Grines V. Diffeomorphisms with orientable heteroclinic sets on two-dimensional manifolds. Methods of the quantitative theory of differential equations. Gorkii: Gorkii State University; 1985, pp. 139–152.
4. Bezdenezhnyh AN, Grines V. Dynamic properties and topological classification of gradient-like diffeomorphisms on two-dimensional manifolds I (II). KTUD Methods. In: Leontovich-Andronova EA, editors. Gor’kij; 1987. p. 24–32. Selected translations Dynamic Selecta Math. Soviet. 11(1), 1–11 (1992).
5. Bonatti Ch, Grines V, Pochinka O. 2019. Topological classification of Morse-Smale diffeomorphisms on 3-manifolds. Duke Mathematical Journal.