Radio Observations of OH in the Interstellar Medium

@article{Weinreb1963RadioOO,
  title={Radio Observations of OH in the Interstellar Medium},
  author={Sander Weinreb and Alan H. Barrett and Marion Littleton Meeks and John C. Henry},
  journal={Nature},
  year={1963},
  volume={200},
  pages={829-831}
}
Existence of oh in interstellar medium, detected in radio absorption spectrum of cassiopeia-a 

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