1. D. V. Anosov, Geodesic Flows on Closed Riemann Manifolds of Negative Curvature [in Russian], Tr. Matem. Inst. im. V. A. Steklova, Vol. 90 (1967).
2. M. I. Brin and Ya. B. Pesin, "Partially hyperbolic dynamic systems," Izv. Akad. Nauk SSSR, Ser. Matem.,38, 170?212 (1973).
3. H. Yamabe, "On arcwise connected subgroup of a Lie group," Osaka Math. J.,2, 13?14 (1950).
4. A. B. Katok, "Dynamic systems with hyperbolic structure," Ninth Summer Math. School [in Russian], Izd. Inst. Matematiki Akad. Nauk UkrainSSR, Kiev (1972), pp. 125?211.
5. J. Moser, "On a theorem of Anosov," J. Diff. Equations,5, No. 3, 411?440 (1969).