%0 Journal Article
%A G. V. Osinnikova
%A I. N. Sergeev
%T The unattainability of central indices in a class of regular systems
%J Vestnik Moskovskogo universiteta. Matematika, mehanika
%D 1987
%P 39-44
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VMUMM_1987_4_a9/
%G ru
%F VMUMM_1987_4_a9