%0 Journal Article
%A S. V. Belyi
%A È. R. Tsekanovskii
%T Classes of operator $R$-functions and their realization by conservative systems
%J Doklady Akademii Nauk
%D 1991
%P 441-445
%V 321
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1991_321_3_a0/
%G ru
%F DAN_1991_321_3_a0