TY  - JOUR
AU  - Niechwiej, Jan
TI  - Two conditions for subnormality of unbounded operators
JO  - Glasgow mathematical journal
PY  - 2001
SP  - 23
EP  - 28
VL  - 43
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.1017/S0017089501010035/
DO  - 10.1017/S0017089501010035
ID  - 10_1017_S0017089501010035
ER  -