1. Abraham, R., and Smale, S., Nongenericity of ω-stability, in “Global Analysis” (Proc. Symp. Pure Math. 1970 14), p. 5. Amer. Math. Soc., Providence, Rhode Island.
2. Anosov, D. V., Geodesic flows on compact manifolds of negative curvature, Trudy Mat. Inst. Steklov 90 (1967); Proc. Steklov Inst., Amer. Math. Soc. transl. (1969).
3. Bowen, R., Topological entropy and Axiom A, see ref. [1], p. 23.