%0 Journal Article
%A A. D. Korshunov
%T On the power and structure of some closed Post classes (families
%J Doklady Akademii Nauk
%D 1987
%P 533-537
%V 295
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_295_3_a3/
%G ru
%F DAN_1987_295_3_a3