1. The emperor's clothes syndrome;Gross;New Eng J Med,1971
2. Clinical Auscultation of the Heart;Levine,1969
3. Audibility of the fourth heart sound: a prospective, blinded investigation (abstr);Spodick;Circulation,1971
4. Normal cardiac physiology;Adolph,1968
5. Splitting of the first and second heart sounds;Leatham;Lancet,1954