%0 Journal Article
%A V. A. Yankov
%T Conjunctively indecomposable formulas in propositional calculi
%J Izvestiya. Mathematics 
%D 1969
%P 17-35
%V 3
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1969_3_1_a2/
%G en
%F IM2_1969_3_1_a2