Sommer, Gabriele (1992) 'A survey on language death in Africa', in Brenzinger, Matthias (ed.) Language Death: Factual and Theoretical Explorations with Special Reference to East Africa.
In 1992, Sommer, Gabriele conducted a survey of language loss in Africa, which is discussed in Brenzinger's edited volume 'Language Death: Factual and Theoretical Explorations with Special Reference to East Africa'.