TY - JOUR AU - Maria Fragoulopoulou TI - The Shirali–Ford theorem as a consequence of Ptak theory for hermitian Banach algebras JO - Studia Mathematica PY - 2002 SP - 121 EP - 132 VL - 150 IS - 2 UR - http://geodesic.mathdoc.fr/articles/10.4064/sm150-2-2/ DO - 10.4064/sm150-2-2 LA - en ID - 10_4064_sm150_2_2 ER -