Adén, D., & Grebel, E. K. (2009). A photometric and spectroscopic study of the new dwarf spheroidal galaxy in Hercules: Metallicity, velocities, and a clean list of RGB members. Astronomy and astrophysics, 506(3), . https://doi.org/10.1051/0004-6361/200912718
Chicago Style (17th ed.) CitationAdén, Daniel, and Eva K. Grebel. "A Photometric and Spectroscopic Study of the New Dwarf Spheroidal Galaxy in Hercules: Metallicity, Velocities, and a Clean List of RGB Members." Astronomy and Astrophysics 506, no. 3 (2009). https://doi.org/10.1051/0004-6361/200912718.
MLA (9th ed.) CitationAdén, Daniel, and Eva K. Grebel. "A Photometric and Spectroscopic Study of the New Dwarf Spheroidal Galaxy in Hercules: Metallicity, Velocities, and a Clean List of RGB Members." Astronomy and Astrophysics, vol. 506, no. 3, 2009, https://doi.org/10.1051/0004-6361/200912718.