%0 Journal Article
%A Ya. S. Smetanich
%T On statement calculi with an additional operation
%J Doklady Akademii Nauk
%D 1961
%P 309-312
%V 139
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1961_139_2_a12/
%G ru
%F DAN_1961_139_2_a12