1. Lefrak, E. A. and Starr, A. (1979). Cardiac Valve Prostheses. (New York: Appleton-CenturyCrofts
2. Starr, A. and Edwards, M. L. (1961). Mitral replacement: Clinical experience with a ballvalve prosthesis. Ann. Surg., 154, 726
3. Roberts, W. C. and Morrow, A. G. (1967). Anatomic studies of hearts containing cagedball prosthetic valves. Johns Hopkins Med. J., 121, 271
4. Kay, E. B., Suzuki, A., Demaney, M. and Zimmerman, H. A. (1966). Comparison of ball and disc valves for mitral valve replacement. Am. ]. Cardial., 18, 504
5. Hufnagel, C. A. and Conrad, P. W. (1965). Comparative study of some prosthetic valves for aortic and mitral replacement. Surgery, 57, 205