Lange, Dierk (2006). „The 'Mune'-Symbol as the Ark of the Covenant between Duguwa and Sefuwa”(PDF). Newsletter. Borno Museum Society (66–67): 15—25. Приступљено 16. 5. 2019 — преко dierklange.com. The article has a map (page 6) of the ancient Central Sahara and proposes to identify Agisymba of 100 CE with the early Kanem state.