Kik et al. 2021

Kik, Alfred and Adamec, Martin and Aikhenvald, Alexandra Y. and Bajzekova, Jarmila and Baro, Nigel and Bowern, Claire and Colwell, Robert K. and Drozd, Pavel and Duda, Pavel and Ibalim, Sentiko and Jorge, Leonardo R. and Mogina, Jane and Ruli, Ben and Sam, Katerina and Sarvasy, Hannah and Saulei, Simon and Weiblen, George D. and Zrzavy, Jan and Novotny, Vojtech. 2021. Language and ethnobiological skills decline precipitously in Papua New Guinea, the world's most linguistically diverse nation. Proceedings of the National Academy of Sciences 118. National Academy of Sciences.

https://www.pnas.org/content/118/22/e2100096118

@article{jacquesestimative-kik21decline,
  author    = {Kik, Alfred and Adamec, Martin and Aikhenvald, Alexandra Y. and Bajzekova, Jarmila and Baro, Nigel and Bowern, Claire and Colwell, Robert K. and Drozd, Pavel and Duda, Pavel and Ibalim, Sentiko and Jorge, Leonardo R. and Mogina, Jane and Ruli, Ben and Sam, Katerina and Sarvasy, Hannah and Saulei, Simon and Weiblen, George D. and Zrzavy, Jan and Novotny, Vojtech},
  eprint    = {https://www.pnas.org/content/118/22/e2100096118.full.pdf},
  journal   = {Proceedings of the National Academy of Sciences},
  number    = {22},
  publisher = {National Academy of Sciences},
  title     = {Language and ethnobiological skills decline precipitously in Papua New Guinea, the world's most linguistically diverse nation},
  url       = {https://www.pnas.org/content/118/22/e2100096118},
  volume    = {118},
  year      = {2021}
}