TY - JOUR AU - M. S. Agranovich TI - Boundary value problems for systems with a parameter JO - Sbornik. Mathematics PY - 1971 SP - 25 EP - 64 VL - 13 IS - 1 UR - http://geodesic.mathdoc.fr/item/SM_1971_13_1_a2/ LA - en ID - SM_1971_13_1_a2 ER -