%0 Journal Article
%A S. V. Popov
%T On the complexity of derivations in classical propositional calculus
%J Doklady Akademii Nauk
%D 1976
%P 1041-1044
%V 228
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1976_228_5_a7/
%G ru
%F DAN_1976_228_5_a7