@article{MZM_1986_39_5_a5,
     author = {I. R. Liflyand},
     title = {Exact order of the {Lebesgue} constants of hyperbolic partial sums of multiple {Fourier} series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {674--683},
     year = {1986},
     volume = {39},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1986_39_5_a5/}
}