TY - JOUR AU - J. V. Rybalov TI - Estimation of the derivative of a function in terms of derivatives of higher order; application to the solvability of the first homogeneous boundary value problem for a linear nonregular elliptic equation JO - Differencialʹnye uravneniâ PY - 1975 SP - 1664 EP - 1677 VL - 11 IS - 9 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1975_11_9_a14/ LA - ru ID - DE_1975_11_9_a14 ER -