1. Hoffman JIE (1968) Natural history of congenital heart disease. Problems in its assessment with special reference to ventricular septal defect. Circulation 37: 97–125
2. Keith JD, Rowe RD, Vlad P (1978) Heart disease in infancy and childhood (3rd edn). Macmillan, New York, pp 320–321
3. Edwards JE (1960) Congenital malformations of the heart and great vessels. In: Gould SE (ed) Pathology of the heart, Thomas, Springfield, 111.
4. Yokoyama M, Takao A, Sakakibara S (1970) Natural history and surgical indications of ventricular septal defect. Am Heart J 80: 597–605
5. Goor DA, Lillehei CW, Rees R, Edwards JE (1970) Isolated ventricular septal defect. Developmental basis for various types and presentation of classification. Chest 58: 468–482