%0 Journal Article
%A S. M. Ratseev
%T Conditions for the existence of perfect ciphers with a~fixed set of parameters
%J Prikladnaya Diskretnaya Matematika. Supplement
%D 2014
%P 54-56
%N 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PDMA_2014_7_a23/
%G ru
%F PDMA_2014_7_a23