%0 Journal Article
%A V. A. Matulis
%T Variants of the classical predicate calculus with a unique tree of deduction
%J Doklady Akademii Nauk
%D 1963
%P 768-770
%V 148
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1963_148_4_a7/
%G ru
%F DAN_1963_148_4_a7