%0 Journal Article
%A L. L. Maksimova
%T Modal logics and varieties of modal algebras: the Beth,
%J Algebra i logika
%D 1992
%P 145-166
%V 31
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1992_31_2_a3/
%G ru
%F AL_1992_31_2_a3