TY  - JOUR
AU  - G. N. Yakovlev
TI  - Differential properties of the extremals of quadratic functionals with discontinuous coefficients
JO  - Differencialʹnye uravneniâ
PY  - 1971
SP  - 1288
EP  - 1293
VL  - 7
IS  - 7
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1971_7_7_a11/
LA  - ru
ID  - DE_1971_7_7_a11
ER  -