TY  - BOOK
AU  - Lang Serge
TI  - Fundamentals of differential geometry
T2  - "Graduate Texts in Mathematics, 191"
SN  - 038798593x
U1  - "B6:3, N9" 
PY  - 1999///
CY  - N.
PB  - York Springer-Verlag      
KW  - Economics
ER  -