TY  - BOOK
AU  - Brechtken-Manderscheid, Ursula
AU  - Engstrom, P. G.
TI  - Introduction to the calculus of variations
T2  - Chapman & Hall Mathematics
SN  - 9780412367007
U1  - 515.64 
PY  - 1991///
CY  - London
PB  - Chapman & Hall/CRC Press
N1  - "Translated from the German by P. G. Engstrom"
ER  -