1. Atkins DL, Clark EB, Marvin WJ (1982) Foramen ovale/ atrial septum ratio: a marker of transatrial blood flow. Circulation 66: 281–283
2. Berg KA (1988) Genetic epidemiology of congenital cardiovascular malformations: an analysis of left out flow tract defects. Thesis from the Faculty of Graduate School, University of Maryland, Baltimore
3. Boughman JA, Berg KA, Astemborski JA et al. (1987) Familial risks of congenital heart defect assessed in a population based epidemiologic study. Am J Med Genet 26: 839–849
4. Brenner JI, Berg KA, Schneider DS, Clark EB, Boughman JA (1989) Congenital cardiovascular malformations in first degree relatives of infants with hypoplastic left heart syndrome. Am J Dis Child 143: 1492–1494
5. Burn J (1987) The aetiology of congenital heart disease. In: Anderson RH, Macartney FJ, Shinebourne RA, Tynam M (eds) Pediatric cardiology. Churchill Living stone, Edinburgh, pp 15–63