References
- Elliot and Childe (1948) Calcification in the obliterated Ductus Arteriosus of an infant. The Am. J. Roentgenology, 60:3, p. 411.
- Nichol and Brannan (1947) The Differentiation of patent Ductus Arteriosus and atrial septal defect. The Am. J. Roentgenology, 58:6, p. 697.