TY  - DATA
AU  - Werner Ballmann; Misha Gromov; Viktor Schroeder
TI  - Manifolds of Nonpositive Curvature
SN  - 9781468491593
PY  - 1985///
PB  - Birkhäuser Boston
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/978-1-4684-9159-3
ER  -