Skottfelt, J., Giannini, E., & Lundkvist, M. S. (2013). EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981. Astronomy and astrophysics, 555, . https://doi.org/10.1051/0004-6361/201321819
Chicago Style (17th ed.) CitationSkottfelt, Jesper, Emanuela Giannini, and Mia S. Lundkvist. "EMCCD Photometry Reveals Two New Variable Stars in the Crowded Central Region of the Globular Cluster NGC 6981." Astronomy and Astrophysics 555 (2013). https://doi.org/10.1051/0004-6361/201321819.
MLA (9th ed.) CitationSkottfelt, Jesper, et al. "EMCCD Photometry Reveals Two New Variable Stars in the Crowded Central Region of the Globular Cluster NGC 6981." Astronomy and Astrophysics, vol. 555, 2013, https://doi.org/10.1051/0004-6361/201321819.