[Ultrasonic determination of cardiac output].

@article{Takenaka1981UltrasonicDO,
  title={[Ultrasonic determination of cardiac output].},
  author={Katsu Takenaka and Tomohiro Sakamoto},
  journal={Nihon rinsho. Japanese journal of clinical medicine},
  year={1981},
  volume={39 7},
  pages={2483-91}
}