%0 Journal Article
%A S. V. Popov
%T An undecidable intermediate calculus
%J Algebra i logika
%D 1981
%P 654-706
%V 20
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_1981_20_6_a3/
%G ru
%F AL_1981_20_6_a3