1. Projections of population of the United States by age, sex, and color to 1990; No. 381;Siegel,1967
2. A transistorized, self-contained, implantable pacemaker for the long-term correction of complete heart block;Chardack;Surgery,1960
3. Intracardiac stimulation for complete heart block;Langergren;Acta Chir. Scand.,1963
4. The status of permanent pacing of the heart in the United States and Canada;Parsonnet;Ann. Cardiol. Angeiol.,1971