1. Late death due to escape of ball from mitral valve prosthesis;Keen;J Thorac Cardiovasc Surg,1974
2. Early disc dislodgement;Messmer;J Thorac Cardiovasc Surg,1973
3. The knotless suture method for prosthetic valve fixation;Wada;Int Surg,1966
4. A New Hingeless Valve;Wada,1969
5. Cardiac valve replacement with Wada-Cutter prosthesis;Wada;J Thorac Cardiovasc Surg,1974