TY - JOUR AU - B. V. Verbitskii TI - On~a~global property of a~matrix-valued function of one variable JO - Sbornik. Mathematics PY - 1973 SP - 53 EP - 65 VL - 20 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1973_20_1_a2/ LA - en ID - SM_1973_20_1_a2 ER -