@article{dietrich_drude_2015,  title={Variation in Tupi languages: Genealogy, language change, and typology},  volume={10},  ISSN={1981-8122},  url={https://doi.org/10.1590/1981-81222015000200002},  DOI={10.1590/1981-81222015000200002},  number={2},  journal={Boletim do Museu Paraense Emílio Goeldi. Ciências Humanas},  publisher={MCTI/Museu Paraense Emílio Goeldi},  author={Dietrich, Wolf and Drude, Sebastian},  year={2015},  month={May},  pages={213–215} }