Electrophysiologic testing after aortic valve replacement in two patients with aortic stenosis and preoperative ventricular fibrillation - Siostrzonek, P; Gössinger, H; Prischl, F; Geissler, K; Schneeweiss, B; Ciciyasvilli, H; Schmoliner, R; Mösslacher, H (European heart journal, 1990)