Uhlirz, M. Untersuchungen {uml}uber Inhalt und Datierung der Briefe Gerberts von Aurillac ... 1957.
New Cath. encycl., 1981 (Sylvester II, Pope, 999-1003; secular name Gerbert, b. Aurillac, France, ca. 945; d. 1003)
Bacchiega, M. Silvestro II ... 1981.
Silvestre II (Gerbert d'Orlhac), 1998.
Contardi, E. Gerberto d'Aurillac, Silvestro II, 1939.
Wikipedia, 14 September 2016 (Pope Sylvester II or Silvester II; born c. 946 in Belliac, Auvergne, France; entered the monastery of St. Gerard of Aurillac around 963; died 12 May 1003 in Rome, Papal States; birth name Gilbertus (Gerbert); pope from 2 April 999 to 12 May 1003)