%0 Journal Article
%A V. V. Rybakov
%T A criterion for admissibility of rules in the modal system
%J Algebra i logika
%D 1984
%P 546-572
%V 23
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1984_23_5_a5/
%G ru
%F AL_1984_23_5_a5