@article{SM_2020_211_12_a0,
     author = {V. I. Buslaev},
     title = {Necessary and sufficient conditions for~extending a~function to {a~Schur} function},
     journal = {Sbornik. Mathematics},
     pages = {1660--1703},
     publisher = {mathdoc},
     volume = {211},
     number = {12},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_12_a0/}
}