Gravar-mail: Atrial and Ventricular Fibrillation: Mechanisms and Device Therapy, the Bakken Research Center Series, Vol.9, Edited by Maurits A. Allessie and Martin Fromer, Futura Publishing Company, Inc., Armonk, N.Y. (1997) 424 pages, illustrated, $98.00 ISBN: 0‐87993‐650‐9