TY  - JOUR
AU  - A. I. Perov
AU  - V. L. Khatskevich
TI  - Regularity classes of bilinear forms, and nonlinear elliptic boundary value problems
JO  - Differencialʹnye uravneniâ
PY  - 1988
SP  - 464
EP  - 476
VL  - 24
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1988_24_3_a12/
LA  - ru
ID  - DE_1988_24_3_a12
ER  -