TY  - JOUR
AU  - Klaus-J. Engel
TI  - Polynomial operator matrices as semigroup generators: the 2 x 2 case.
JO  - Mathematische Annalen
PY  - 1989
SP  - 563
EP  - 576
VL  - 284
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164572/
ID  - MAN_1989__284_4_164572
ER  -