TY  - JOUR
AU  - V. V. Kozlov
TI  - Lagrange's identity and its generalizations
JO  - Russian journal of nonlinear dynamics
PY  - 2008
SP  - 157
EP  - 168
VL  - 4
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ND_2008_4_2_a3/
LA  - ru
ID  - ND_2008_4_2_a3
ER  -