TY - JOUR AU - I. G. Petrovskii TI - Some complements to the articles of O.~Perron and L.\,A.~Ljusternik on the Dirichlet problem JO - Trudy Matematicheskogo Instituta imeni V.A. Steklova PY - 1970 VL - 25 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/RM_1970_25_4_a9/ LA - ru ID - RM_1970_25_4_a9 ER -