%0 Journal Article
%A A. A. Shum
%T Varieties of algebraic systems and propositional calculi
%J Algebra i logika
%D 1984
%P 341-359
%V 23
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1984_23_3_a7/
%G ru
%F AL_1984_23_3_a7