@article{SM_1984_47_1_a14,
     author = {K. S. Kazarian},
     title = {On some questions in the theory of orthogonal series},
     journal = {Sbornik. Mathematics},
     pages = {269--285},
     year = {1984},
     volume = {47},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1984_47_1_a14/}
}