SWIGGERS, Pierre. Two key concepts of language endangerment : language obsolescence and language death. Linguistica, Ljubljana, SI, v. 47, n. 1, p. 21–33, 2007. DOI: 10.4312/linguistica.47.1.21-33. Disponível em: https://journals.uni-lj.si/linguistica/article/view/3495.. Acesso em: 10 oct. 2024.