TY  - BOOK
AU  - Brechtken-Mand U
TI  - Introduction to the calculus of variations Tr by P
T2  - Chapman and Hall Mathematics
U1  - B32, N1 
PY  - 1991///
CY  - London
PB  - Chapman and Hall        
KW  - Calculus
N1  - Bibliography: P 197-198
ER  -