TY - JOUR AU - M. I. Èskin TI - A boundary value problem for an overdetermined system of two second order equations JO - Doklady Akademii Nauk PY - 1969 SP - 491 EP - 494 VL - 189 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1969_189_3_a11/ LA - ru ID - DAN_1969_189_3_a11 ER -