Letter: Unstable angina pectoris and coronary bypass surgery.

@article{Shaffer1974LetterUA,
  title={Letter: Unstable angina pectoris and coronary bypass surgery.},
  author={A B Shaffer and Peter C Gazes},
  journal={Circulation},
  year={1974},
  volume={49 1},
  pages={196-7}
}