References
- Jonsson, G. , Broden, B. , Hanson, H. E. and Karnell, J. (1948) Visualization of Patent Ductus Arteriosus Botalli by Means of Thoracic Aortography. Acta radiol., 30, p. 81.
- Levine, S. A. (1947) The Diagnosis of Patent Ductus Arteriosus and the Indications for Operation. Acta med. Scandinav.