\Bibitem{Lif86} \by I.~R.~Liflyand \paper Exact order of the Lebesgue constants of hyperbolic partial sums of multiple Fourier series \jour Mat. Zametki \yr 1986 \vol 39 \issue 5 \pages 674--683 \mathnet{http://mi.mathnet.ru/mzm5090} \mathscinet{http://mathscinet.ams.org/mathscinet-getitem?mr=850804} \zmath{https://zbmath.org/?q=an:0607.42013} \transl \jour Math. Notes \yr 1986 \vol 39 \issue 5 \pages 369--374 \crossref{https://doi.org/10.1007/BF01156675} \isi{https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=Publons&SrcAuth=Publons_CEL&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=A1986F578200006}