@article{IVM_1980_9_a1,
     author = {A. R. Abdulgamidov},
     title = {Properties of coefficients of orthogonal series},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {5--6},
     year = {1980},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1980_9_a1/}
}