@book{1998anonstatisticaldatasakhalinainuyear,
  title = {Statistical data on Sakhalin Ainu for the year 1904},
  year = {1998},
  doi = {10.1515/9783110820768-019},
  language = {ain},
  url = {https://doi.org/10.1515/9783110820768-019}
}