%0 Journal Article
%A V. M. Bruk
%T On linear relations generated by nonnegative operator function and degenerate elliptic differential-operator expression
%J Žurnal matematičeskoj fiziki, analiza, geometrii
%D 2009
%P 123-144
%V 5
%N 2
%U http://geodesic.mathdoc.fr/item/JMAG_2009_5_2_a1/
%G en
%F JMAG_2009_5_2_a1