%0 Journal Article
%A S. M. Grudskii
%T Factorization of $u$-periodic matrix-functions and problems with
%J Doklady Akademii Nauk
%D 1987
%P 1298-1302
%V 295
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1987_295_6_a2/
%G ru
%F DAN_1987_295_6_a2