@article{ISU_2018_18_1_a4,
     author = {K. A. Navasardyan},
     title = {On the representation of functions by absolutely convergent series by $\mathcal{H}$-system},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {49--61},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2018_18_1_a4/}
}