TY  - JOUR
AU  - Werner Ricker
TI  - A Criterion for an Operator with Real Spectrum to Be of Scalar-type.
JO  - Monatshefte für Mathematik
PY  - 1983
SP  - 229
EP  - 234
VL  - 95
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MOMA_1983__95_178122/
ID  - MOMA_1983__95_178122
ER  -