%0 Journal Article
%A M. F. Timan
%A V. G. Ponomarenko
%T The approximation of periodic functions of two variables by sums of Marcinkiewicz type
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1975
%P 59-67
%N 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1975_9_a9/
%G ru
%F IVM_1975_9_a9