%0 Journal Article
%A Klaus-J. Engel
%T Polynomial operator matrices as semigroup generators: the 2 x 2 case.
%J Mathematische Annalen
%D 1989
%P 563-576
%V 284
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164572/
%F MAN_1989__284_4_164572