1. Starr A, Edwards ML (1961) Mitral replacement: clinical experience with a ball-valve prosthesis. Ann Surg 154: 726
2. Roberts WC (1976) Choosing a substitute cardiac valve: type, size, surgeon. Ann J Cardiol 38: 633
3. Lefrak EA, Starr A (1976) Cardiac valve prostheses. Historical aspects of cardiac valve replacement. Appleton-Century-Crofts, New York, p 3
4. Horstkotte D, Haerten K, Schulte HD et al (1983) Hemodynamic findings at rest and during exercise after implantation of different mitral valve prostheses with equal tissue annulus diameters. Z Kardiol 72: 385
5. Horstkotte D, Haerten K, Körfer R et al (1983) Hemodynamic findings ar rest and during exercise after implantation of different aortic valve prostheses. Z Kardiol 72: 429