TY - JOUR AU - L. I. Kamynin AU - B. N. Khimchenko TI - The strict extremum principle for a $D-(\Phi ,\,\Omega )$-elliptically connected second-order operator JO - Differencialʹnye uravneniâ PY - 1979 SP - 1307 EP - 1317 VL - 15 IS - 7 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1979_15_7_a15/ LA - ru ID - DE_1979_15_7_a15 ER -