TY - JOUR AU - Marek Ptak TI - Continuous isometric semigroups and reflexivity JO - Annales Polonici Mathematici PY - 1991 SP - 21 EP - 28 VL - 54 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/ap-54-1-21-28/ DO - 10.4064/ap-54-1-21-28 LA - en ID - 10_4064_ap_54_1_21_28 ER -