1. Indications for Closed- or Open-Heart Surgery for Mitral Stenosis: Review of 152 Operated Cases;Ankeney;Ann. Thorac. Surg.,1967
2. Cardiac Valve Replacement: A Seven-Year Follow-up;Aston;J. Thorac. Cardiovasc. Surg,1971
3. Calculation of Survival Rates for Cancer;Berkson;Proc. Staff Meet. Mayo Clin.,1960
4. Data provided in professional service bulletins published by Edwards Laboratories, Inc., Santa Ana, Calif.
5. Long-Term Results After Cardiac Valve Replacement: Clinical Experience with 2,097 Patients;Cooley,1969