%0 Journal Article
%A Diagana, Toka
%T Algebraic sum of unbounded normal operators and the square root problem of Kato
%J Rendiconti del Seminario Matematico della Università di Padova
%D 2003
%P 269-275
%V 110
%I Seminario Matematico of the University of Padua
%U http://www.numdam.org/item/RSMUP_2003__110__269_0/
%G en
%F RSMUP_2003__110__269_0