TY  - DATA
AU  - P.A. Griffiths
TI  - Exterior Differential Systems and the Calculus of Variations
SN  - 9781461581666
PY  - 1983///
PB  - Birkhäuser Boston
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/978-1-4615-8166-6
ER  -