TY  - BOOK
AU  - Tu, Loring W.
TI  - Differential geometry: : connections, curvature, and characteristic classes / 
T2  - Graduate text in mathematics
SN  - 9783319855622
U1  - 516 
PY  - 2017///
CY  - Switzerland
PB  - Springer
N1  - Includes bibliographical references and index
ER  -