supergiant, entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight, David Darling, on line, accessed May 15, 2007.
hypergiant, entry in The Encyclopedia of Astrobiology, Astronomy, and Spaceflight, David Darling, on line, accessed May 15, 2007.
doi.org
The End of the Main Sequence, Gregory Laughlin, Peter Bodenheimer, and Fred C. Adams, The Astrophysical Journal, 482 (June 10, 1997), pp. 420–432. Bibcode: 1997ApJ...482..420L . doi:10.1086/304125.
harvard.edu
ui.adsabs.harvard.edu
The End of the Main Sequence, Gregory Laughlin, Peter Bodenheimer, and Fred C. Adams, The Astrophysical Journal, 482 (June 10, 1997), pp. 420–432. Bibcode: 1997ApJ...482..420L . doi:10.1086/304125.