@article{ZNSL_1978_80_a10,
     author = {M. A. Skopina},
     title = {Asymptotic formulas for the deviation of linear summation methods of double {Fourier} series},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {189--196},
     year = {1978},
     volume = {80},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_80_a10/}
}