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- [7] LATE RESULTS OF HEART VALVE REPLACEMENT WITH BALL-VALVE PROSTHESIS JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY, 1968, 56 (01): : 83 - &
- [8] MITRAL VALVE REPLACEMENT - CLINICAL EXPERIENCE WITH THE BALL-VALVE PROSTHESIS DISEASES OF THE CHEST, 1963, 43 (05): : 529 - 538