Primary pulmonary hypertension.

@article{Kher1979PrimaryPH,
  title={Primary pulmonary hypertension.},
  author={H L Kher and I M Ahuja and G R Narayanan and Micheal Durairaj},
  journal={The Journal of the Association of Physicians of India},
  year={1979},
  volume={29 8},
  pages={671-4}
}