Twinkle, twinkle quasi star…

@article{Abramowicz1982TwinkleTQ,
  title={Twinkle, twinkle quasi star…},
  author={Marek Abramowicz},
  journal={Nature},
  year={1982},
  volume={298},
  pages={789-790}
}

References

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The Compact source at the Galactic Center
Various circumstantial arguments for (and against) the presence of a massive black hole (≲5×106M⊙) are mentioned and assessed; in particular, the upper limits to the hole’s mass based on