TY - JOUR AU - A. Sołtysiak TI - On the projection property of approximate point joint spectra JO - Commentationes Mathematicae PY - 1989 SP - 79 EP - 84 VL - 29 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v29i1.6258/ DO - 10.14708/cm.v29i1.6258 LA - pl ID - 10_14708_cm_v29i1_6258 ER -