TY  - JOUR
AU  - W. Żelazko
TI  - On a problem concerning joint approximate point spectra
JO  - Studia Mathematica
PY  - 1973
SP  - 239
EP  - 240
VL  - 45
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-45-3-239-240/
DO  - 10.4064/sm-45-3-239-240
LA  - en
ID  - 10_4064_sm_45_3_239_240
ER  -