Empire of the Stars: Obsession, Friendship, and Betrayal in the Quest for Black Holes, Arthur I. Miller, Boston, New York: Houghton Mifflin, 2005, ISBN0-618-34151-X; reviewed at The Guardian: The battle of black holesArchived 2006-10-11 at the Wayback Machine.
Koester, D.; Reimers, D. (1996). "White dwarfs in open clusters. VIII. NGC 2516: a test for the mass-radius and initial-final mass relations". Astronomy and Astrophysics. 313: 810–814. Bibcode:1996A&A...313..810K.
Empire of the Stars: Obsession, Friendship, and Betrayal in the Quest for Black Holes, Arthur I. Miller, Boston, New York: Houghton Mifflin, 2005, ISBN0-618-34151-X; reviewed at The Guardian: The battle of black holesArchived 2006-10-11 at the Wayback Machine.