Madiyono, Bambang, Ismet Oesman, Sudigdo Sastroasmoro, Sukman Putra, Eva Soelaiman, and Kukuh Rachmad. 1989. “Patent Ductus Arteriosus Before and After Surgery”. Paediatrica Indonesiana 29 (3-4), 39-51. https://doi.org/10.14238/pi29.3-4.1989.39-51.