When the Pope was a Mathematician.Published in:College Mathematics Journal, 2005, v. 36, n. 5, p. 354, doi. 10.1080/07468342.2005.11922149By:Atkinson, LeighPublication type:Article
Gerbert of Aurillac: Mathematician and Pope.Published in:Mathematical Intelligencer, 2000, v. 22, n. 4, p. 67, doi. 10.1007/BF03026774By:Pekonen, OsmoPublication type:Article