TY  - BOOK
AU  - Donder, Th. De.
TI  - Theorie invariantive du calcul des variations
SN  - 1
U1  - 517.4 
PY  - 1930///
CY  - Paris
PB  - Gauthier-Villars
KW  - Calculus of variations
N1  - Various pagings
ER  -