1. Assey ME, Usher BW, Hendrix GH. Valvular heart disease: Use of invasive and noninvasive techniques in clinical decision-making. Part 2: Mitral valve disease. Mod Concepts Cardiovas Dis. 1989; 58: 61.
2. Bland EF. Declining severity of rheumatic fever; a comparative study of the past four decades. N Engl J Med. 1960; 262: 597.
3. Braunwald E, ed. Heart Disease. A Textbook of Cardiovascular Medicine. Philadelphia, PA: WB Saunders; 1984: 1064.
4. Braunwald E, ed. Heart Disease. A Textbook of Cardiovascular Medicine. Philadelphia, PA: WB Saunders; 1984: 1460.
5. Carabello BA, Grossman W. Calculation of Stenotic Valve Orifice Area. In Grossman W, ed. Cardiac Catheterization and Angiography. 3rd ed. Philadelphia, PA: Lea & Febiger; 1986: 143–154.