@article{SM_1988_59_2_a5,
     author = {V. I. Buslaev},
     title = {Relations for the coefficients, and singular points of a~function},
     journal = {Sbornik. Mathematics},
     pages = {349--377},
     publisher = {mathdoc},
     volume = {59},
     number = {2},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1988_59_2_a5/}
}