@article{DAN_1973_208_1_a7,
     author = {I. I. Ibragimov},
     title = {On a method for investigating the completeness of systems of analytic functions},
     journal = {Doklady Akademii Nauk},
     pages = {36--38},
     publisher = {mathdoc},
     volume = {208},
     number = {1},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_208_1_a7/}
}