TY - JOUR AU - L. G. Mikhailov TI - The Riemannian type of boundary problem for elliptical systems of first order differential equations JO - Doklady Akademii Nauk PY - 1957 SP - 13 EP - 15 VL - 112 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DAN_1957_112_1_a1/ LA - ru ID - DAN_1957_112_1_a1 ER -