@article{1987yamadakuchiezohokuobunkaken,
  title = {口蝦夷・北奥文化圏という仮称},
  author = {山田 秀三},
  year = {1987},
  journal = {北方研究会々報 7 アイヌ語},
  language = {ain},
  url = {https://aterui.ws.hosei.ac.jp/togo/detail.php?id=8576\&domain=ezo}
}