1. Discussion of Abbott, O.;McGoon,1963
2. Prosthetic valves: Long term results;Kay,1965
3. Discussion Byron, F. X.;Herr,1965
4. Discussion Byron, F. X.;Herr,1965
5. Comparison of ball and disc valves for mitral valve replacement (Abstr.);Kay;Am. J. Cardiol.,1966