TY - JOUR AU - M. A. Shubin TI - Factorization of matrices depending on a parameter, and elliptic equations in a halfspace JO - Sbornik. Mathematics PY - 1971 SP - 65 EP - 84 VL - 14 IS - 1 UR - http://geodesic.mathdoc.fr/item/SM_1971_14_1_a3/ LA - en ID - SM_1971_14_1_a3 ER -