Ultrasonic scanning in obstetrics. I. Principles and applications.

@article{Morrison1969UltrasonicSI,
  title={Ultrasonic scanning in obstetrics. I. Principles and applications.},
  author={Jill Morrison and Renee Blackwell},
  journal={The Australian & New Zealand journal of obstetrics & gynaecology},
  year={1969},
  volume={9 4},
  pages={201-5}
}