%0 Journal Article
%A V. V. V'yugin
%T On upper semilattices of numerations
%J Doklady Akademii Nauk
%D 1974
%P 749-751
%V 217
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1974_217_4_a1/
%G ru
%F DAN_1974_217_4_a1