TY - JOUR AU - G. Markhasev TI - A system of nonorthogonal polynomials for constructing a solution of the Riquier problem in a ball for a semiharmonic equation JO - Differencialʹnye uravneniâ PY - 1990 SP - 714 EP - 718 VL - 26 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DE_1990_26_4_a23/ LA - ru ID - DE_1990_26_4_a23 ER -