TY  - BOOK
AU  - Reichel Wolfgang
TI  - Uniqueness theorems for variational problems by the method of transformation groups
SN  - 3-540-21839-4
U1  - 515.64 
PY  - 2004///
CY  - Berlin
PB  - Springer-Verlag
KW  - Calculus of variations
ER  -