%0 Journal Article
%A V. P. Orevkov
%T Lower bounds for the lengths of deductions in arithmetic in terms
%J Doklady Akademii Nauk
%D 1987
%P 784-787
%V 294
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_294_4_a2/
%G ru
%F DAN_1987_294_4_a2