@book{2019yukioyotsumotorevitalizationoftheainulanguagejapanesegover,
  title = {Revitalization of the Ainu Language: Japanese Government Efforts},
  author = {Yukio Yotsumoto},
  year = {2019},
  url = {https://doi.org/10.1007/978-3-030-02438-3\_144}
}