Publisher
Springer Science and Business Media LLC
Reference15 articles.
1. Adams S. and Ballmann W. (1998). Amenable isometry groups of Hadamard spaces. Math. Ann. 312: 183–195
2. Avez A. (1970). Variétés Riemanniennes sans points focaux. C. R. Acad. Sci. Paris Sér. A-B 270: 188–191
3. Ballmann, W., Gromov, M., Schroeder V.: Manifolds of nonpositive curvature. In: Progress in Math, p. 61. Birkhäuser, Basel (1985)
4. Burago D. and Ivanov S. (1994). Riemannian tori without conjugate points are flat. GAFA 4: 259–269
5. Cheeger J. and Ebin D.G. (1975). Comparison theorems in Riemannian geometry. North-Holland, Amsterdam