@article{KUIPM_1973_a15,
     author = {V. N. Spevakov},
     title = {Absolute summation of orthogonal series by {Riesz} methods},
     journal = {Issledovaniya po Prikladnoi Matematike i Informatike},
     pages = {109--116},
     publisher = {mathdoc},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUIPM_1973_a15/}
}