%0 Journal Article
%A V. V. Arestov
%A V. N. Gabushin
%T Best approximation of unbounded operators by bounded operators
%J Izvestiâ vysših učebnyh zavedenij. Matematika
%D 1995
%P 42-68
%N 11
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IVM_1995_11_a3/
%G ru
%F IVM_1995_11_a3