%0 Journal Article
%A V. N. Strakhov
%T Variational methods in the theory of linear transformations of
%J Doklady Akademii Nauk
%D 1990
%P 63-67
%V 312
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1990_312_1_a13/
%G ru
%F DAN_1990_312_1_a13