@article{SM_1975_27_1_a7,
     author = {N. B. Pogosyan},
     title = {Representation of measurable functions by orthogonal series},
     journal = {Sbornik. Mathematics},
     pages = {93--102},
     year = {1975},
     volume = {27},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_27_1_a7/}
}