%0 Journal Article %A V. I. Buslaev %T Necessary and sufficient conditions for extending a function to a Schur function %J Sbornik. Mathematics %D 2020 %P 1660-1703 %V 211 %N 12 %U http://geodesic.mathdoc.fr/item/SM_2020_211_12_a0/ %G en %F SM_2020_211_12_a0