Nonopacification of patent ductus arteriosus by aortography in patients with large ventricular septal defects.

@article{Rao1978NonopacificationOP,
  title={Nonopacification of patent ductus arteriosus by aortography in patients with large ventricular septal defects.},
  author={P Syamasundar Rao and Mohinder K Thapar and William B. Strong},
  journal={Angiology},
  year={1978},
  volume={29 12},
  pages={888-97}
}