TY - JOUR AU - A. S. Fokht TI - Boundary estimates of the derivatives of the solutions of a certain class of hypoelliptic equations in the $L_2$ metric JO - Differencialʹnye uravneniâ PY - 1970 SP - 1673 EP - 1682 VL - 6 IS - 9 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1970_6_9_a13/ LA - ru ID - DE_1970_6_9_a13 ER -