%0 Journal Article
%A S. M. Ratseev
%T Some generalizations of Shannon's theory of perfect ciphers
%J Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie
%D 2015
%P 111-127
%V 8
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VYURU_2015_8_1_a8/
%G ru
%F VYURU_2015_8_1_a8