TY  - BOOK
AU  - Logan,John David
TI  - Invariant variational principles
T2  - Mathematics in science and engineering
SN  - 0124547508
PY  - 1977///
CY  - New York
PB  - Academic Press
KW  - Calculus of variations
KW  - Invariants
KW  - Transformations (Mathematics)
N1  - Bibliography : p. 165-168
ER  -