TY  - BOOK
AU  - Griffiths Phillip A
TI  - Exterior differential systems and the calculus of variations
T2  - Progress in Mathematics
U1  - B42, M3 
PY  - 1983///
CY  - Boston
PB  - Birkhauser         
KW  - Calculus of variations
N1  - Bibliography 332-335p
ER  -