TY  - JOUR
AU  - L. I. Kamynin
AU  - B. N. Khimchenko
TI  - Theorems on the sign of a derivative for a second-order elliptic-parabolic equation
JO  - Differencialʹnye uravneniâ
PY  - 1984
SP  - 641
EP  - 652
VL  - 20
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1984_20_4_a10/
LA  - ru
ID  - DE_1984_20_4_a10
ER  -