@article{TRSPY_2013_280_a20,
     author = {N. N. Kholshchevnikova},
     title = {Countably multiple null series},
     journal = {Informatics and Automation},
     pages = {288--299},
     publisher = {mathdoc},
     volume = {280},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2013_280_a20/}
}