%0 Journal Article
%A V. G. Durnev
%A A. I. Zetkina
%T An extension of a theorem of Neumann
%J Matematičeskie trudy
%D 2023
%P 41-46
%V 26
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MT_2023_26_1_a2/
%G ru
%F MT_2023_26_1_a2