@article{TVIM_2019_3_a0,
     author = {E. N. Andreishcheva},
     title = {The approximation of indefinite {Schur's} functions},
     journal = {Taurida Journal of Computer Science Theory and Mathematics},
     pages = {7--22},
     publisher = {mathdoc},
     number = {3},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TVIM_2019_3_a0/}
}