Schawinski, Kevin; Urry, C. Megan; Simmons, Brooke D.; Fortson, Lucy; Kaviraj, Sugata; Keel, William C.; Lintott, Chris J.; Masters, Karen L.; Nichol, Robert C. (2014). "The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies". Monthly Notices of the Royal Astronomical Society. 440 (1): 889. arXiv:1402.4814. Bibcode:2014MNRAS.440..889S. doi:10.1093/mnras/stu327.
Schawinski, Kevin; Urry, C. Megan; Simmons, Brooke D.; Fortson, Lucy; Kaviraj, Sugata; Keel, William C.; Lintott, Chris J.; Masters, Karen L.; Nichol, Robert C. (2014). "The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies". Monthly Notices of the Royal Astronomical Society. 440 (1): 889. arXiv:1402.4814. Bibcode:2014MNRAS.440..889S. doi:10.1093/mnras/stu327.
Schawinski, Kevin; Urry, C. Megan; Simmons, Brooke D.; Fortson, Lucy; Kaviraj, Sugata; Keel, William C.; Lintott, Chris J.; Masters, Karen L.; Nichol, Robert C. (2014). "The Green Valley is a Red Herring: Galaxy Zoo reveals two evolutionary pathways towards quenching of star formation in early- and late-type galaxies". Monthly Notices of the Royal Astronomical Society. 440 (1): 889. arXiv:1402.4814. Bibcode:2014MNRAS.440..889S. doi:10.1093/mnras/stu327.