TY  - JOUR
AU  - Jan Stochel
TI  - Characterizations of subnormal operators
JO  - Studia Mathematica
PY  - 1990
SP  - 227
EP  - 238
VL  - 97
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-97-3-227-238/
DO  - 10.4064/sm-97-3-227-238
LA  - en
ID  - 10_4064_sm_97_3_227_238
ER  -