TY  - JOUR
AU  - L. I. Kamynin
TI  - A~theorem on the internal derivative for a~weakly degenerate second-order elliptic equation
JO  - Sbornik. Mathematics
PY  - 1986
SP  - 297
EP  - 316
VL  - 54
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1986_54_2_a1/
LA  - en
ID  - SM_1986_54_2_a1
ER  -