Lombard 2003, p. 93: "Here too Coptic and Greek were progressively replaced by Arabic, although less swiftly. Some dates enable us to trace the history of this process. The conquest of Egypt took place from 639 to 641, and the first bilingual papyrus (Greek and Arabic) is dated 693 and the last 719, while the last papyrus written entirely in Greek is dated 780 and the first one entirely in Arabic 709." Lombard, Maurice (2003). The Golden Age of Islam. Markus Wiener Publishers. ISBN1-55876-322-8.
a proposal to grant separate code gkm was submitted in 2006, but rejected in 2023. "Change Request Documentation: 2006-084". SIL International. Retrieved 2023-12-21.
