1. Manifolds of Nonpositive Curvature (Progress in Mathematics; vol. 61)
by Werner Ballmann, Mikhael Gromov, Viktor Schroeder 
Price: USD 947.32
Dealer: AbebooksUK, dsmbooks
Description: ISBN10: 081763181X, ISBN13: 9780817631819, [publisher: Birkhäuser] Hardcover New [liverpool, United Kingdom] [Publication Year: 1985]