@article{DAN_1963_152_6_a8,
     author = {Yu. A. Ponomarenko},
     title = {Criteria for absolute {Cesaro} summability of multiple {Fourier} series},
     journal = {Doklady Akademii Nauk},
     pages = {1305--1307},
     year = {1963},
     volume = {152},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_152_6_a8/}
}