@article{IVM_1988_9_a0,
     author = {V. A. Andrienko},
     title = {Summability of orthogonal series by {Ces\`aro} methods of negative order},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--10},
     publisher = {mathdoc},
     number = {9},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1988_9_a0/}
}