1. [F-H] Fathi, A., Hermann, M.: Existence de Diffeomorphismes Minimaux, preprint
2. [Th] Thurston, W.: Foliations of Three-Manifolds Which are Circle Bundles, Thesis, U.C. Berkeley 1972
3. [T] Tomter, P.: Anosov Flows on Infra-Homogeneous Spaces, Proceedings of Symposia in Pure Mathematics, Volume XIV