TY  - JOUR
AU  - A. V. Arutyunov
TI  - On the theory of degenerate quadratic forms in the classical calculus of variations
JO  - Izvestiya. Mathematics 
PY  - 1995
SP  - 433
EP  - 476
VL  - 45
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1995_45_3_a0/
LA  - en
ID  - IM2_1995_45_3_a0
ER  -