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Manifolds of nonpositive curvature / by Ballmann, Werner. Publication: Boston : Birkhäuser, 1985 . iv, 263 p. : , Based on four lectures delivered by M. Gromov in Feb. 1981 at Collège de France, Paris, with appendices by W. Ballmann and V. Schroeder. | Includes index. 23 cm. Date: 1985 Availability: Items available: School of Theoretical Physics Library [510.08 PRO] (1),