%0 Journal Article
%A V. V. Arestov
%T Best approximation ol unbounded operators invariant with respect to a~shift by the linear bounded operators
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1992
%P 3-20
%V 198
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TM_1992_198_a0/
%G ru
%F TM_1992_198_a0