TY  - GEN
AU  - Tu, Loring W. 
TI  - Differential geometry: connections, curvature, and characteristic classes
SN  - 9783319855622
U1  - 516.36 TU/D 
PY  - 2017///
CY  - Switzerland
PB  - Springer
KW  - Christoffel symbols
KW  - Gauss–Bonnet theorem
ER  -