@article{UZERU_2017_51_1_a3,
     author = {K. A. Kerian},
     title = {An example of double {Fourier{\textendash}Haar} series with a nonregular subseries},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {18--21},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2017_51_1_a3/}
}