TY  - DATA
AU  - Nagano, Tadashi.
TI  - Homotopy invariants in differential geometry 
T2  - Memoirs of the American Mathematical Society, 
SN  - 9780821898901 (online)
PY  - 1970///
CY  - Providence, R.I.
PB  - American Mathematical Society
UR  - http://www.ams.org/memo/0100
ER  -