TY  - JOUR
AU  - Ian M. Anderson
AU  - Juha Pohjanpelto
TI  - Variational principles for differential equations with symmetries and conservation laws. I. Second order scalar equations.
JO  - Mathematische Annalen
PY  - 1994
SP  - 191
EP  - 222
VL  - 299
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1994__299_4_165205/
ID  - MAN_1994__299_4_165205
ER  -