@article{DAN_1973_213_6_a2,
     author = {S. I. Ibragimov},
     title = {On the completeness of two systems of analytic functions},
     journal = {Doklady Akademii Nauk},
     pages = {1240--1242},
     publisher = {mathdoc},
     volume = {213},
     number = {6},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_213_6_a2/}
}