Clinical applications of dynamic electrocardiography :  the frequency of ventricular tachyarrhythmias and ventricular premature beats in asymptomatic patients / 
Harold L. Karpman, Joseph J. Sheppard, Selvyn B. Bleifer, Daniel J. Bleifer 
 - California :  Rand Corporation,  1971 
 - 23 pages ;  28 cm. 
 - The Rand paper series ;  p.4619 .
 - Rand paper series ;  p.4619 .
<br/><br/>Bibliography: p. 10-15.