Madiyono, B., J. Achmad, S. Sastroasmoro, I. N. Oesman, and S. T. Putra. “Clinical Features and Management of Secundum Atrial Septal Defect in Infants and Children”. Medical Journal of Indonesia, vol. 5, no. 1, Jan. 1996, pp. 42-8, doi:10.13181/mji.v5i1.844.