1. Mitral Valve Replacement with Dacron-covered Disc *Surgitool Inc., Pittsburgh, Pa. Prosthesis to Prevent Thromboembolism: Clinical Experience in 202 Cases;Beall,1969
2. Ball variance in a Starr-Edwards prosthetic mitral valve causing acute pulmonary edema (diagnosis by auscultation before onset of symptoms);Connolly;Mayo Clin. Proc.,1970
3. Experience with the Kay-Shiley Mitral Valve;Hughes,1969
4. Aortic ball variance: Diagnosis and treatment;Hylen;Ann. Intern. Med.,1970
5. Malfunction of mitral ball-valve prostheses due to swollen poppet;Leatherman;J. Thorac. Cardiovasc. Surg.,1969