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Ma, Chung-Pei; Greene, Jenny E.; McConnell, Nicholas; Janish, Ryan; Blakeslee, John P.; Thomas, Jens; Murphy, Jeremy D. (2014-10-28). «The MASSIVE Survey - I. A Volume-Limited Integral-Field Spectroscopic Study of the Most Massive Early-Type Galaxies within 108 Mpc». The Astrophysical Journal795 (2): 158. doi:10.1088/0004-637X/795/2/158. Bibcode: 2014ApJ...795..158M.
Tifft, W. G.; Gregory, S. A. (July 1979). «Band theory applied to the Coma/A 1367 supercluster.» (στα αγγλικά). Astrophysical Journal231: 23–27. doi:10.1086/157158. Bibcode: 1979ApJ...231...23T.