TY - JOUR AU - V. I. Buslaev TI - Necessary and sufficient conditions for~extending a~function to a~Schur function JO - Sbornik. Mathematics PY - 2020 SP - 1660 EP - 1703 VL - 211 IS - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_2020_211_12_a0/ LA - en ID - SM_2020_211_12_a0 ER -