TY  - BOOK
AU  - Bryant, R
AU  - Griffiths, P
TI  - Exterior differential systems and euler-lagrange partial differential equations
SN  - 9780226077949
U1  - 517.9 
PY  - 2003///
CY  - Chicago
PB  - University press
KW  - EXTERIOR DIFFERENTIAL SYSTEM
KW  - LAGRANGE EQUATION
N1  - Includes bibliogrsphical referances and index. (Ref. sec)
ER  -