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References

  • Milone, A. P., Marino, A. F., Piotto, G., Bedin, L. R., Anderson, J., Renzini, A., King, I. R., Bellini, A., Brown, T. M., Cassisi, S., D’Antona, F., Jerjen, H., Nardiello, D., Salaris, M., Marel, D. V. R. P., Vesperini, E., Yong, D., Aparicio, A., Sarajedini, A., & Zoccali, M. (2014, 19 diciembre). The Hubble Space Telescope UV Legacy Survey of galactic globular clusters – II. The seven stellar populations of NGC 7089 (M2)⋆. OUP Academic. https://academic.oup.com/mnras/article/447/1/927/989997
  • Mark Voit, G., & Donahue, M. (1997, 1 septiembre). A Deep Look at the Emission-Line Nebula in Abell 2597. The Astrophysical journal. https://iopscience.iop.org/article/10.1086/304509