 Maurice Gaudefroy-Demombynes added Tunia and "Mana" (possibly an alternate name for Fanian) in 1907, forming a "Groupe Boa".Johannes Lukas (1937) likewise described a "Bua-Gruppe" consisting of Bua, Niellim, and Koke, and in Joseph Greenberg's 1963 classification "The Languages of Africa", the three languages were placed together in the Adamawa subphylum as a group named Adamawa-13.Later, Pairault (1965, 1969) added the more northerly Gula languages, Fanian, Koke, and Bolgo, allowing Samarin (1971) to define roughly the current membership of the Bua languages/Adamawa-13.