1. The fourth heart sound in patients without demonstrable heart disease;Benchimol;Chest,1977
2. Effect of posture on splitting of the second heart sound;Breen;JAMA,1960
3. Bedside Cardiology;Constant,1985
4. Constrictive pericarditis;Evans;Br Heart J,1952
5. Implications of third heart sounds in patients with valvular heart disease;Folland;N Engl J Med,1992