TY  - BOOK
AU  - Logan, John David
TI  - INVARIANT VARIATIONAL PRINCIPLES
U1  - 515.64 
PY  - 1977///
CY  - New York
PB  - Academic Press
KW  - Calculus Of Variations
KW  - Invariations
KW  - Transformations (Mathematics)
N1  - Bibliographical References
ER  -