1. [1] Perloff JK. The clinical recognition of congenital heart disease. 5th edn. Saunders 2002:233-63.
2. [2] Webb GD. Congenital heart disease in Braunwald's Heart disease. 7th edn. Elsevier Saunders 2005:1489- 547.
3. [3] Saxena A, Divekar A, Soni NR, et al. Natural history of secundum ASD revisited in the era of transcatheter closure. Indian Heart Jounal 2005:57(1):35-8.
4. Atrial septal defect in patients aged 60 years or older: operative results and long term post-operative follow up;Sutton;Circulation,1981
5. Follow-up at 27 to 32 years;Murphy;N Engl J Med,1990