Hiroki Takakura.
Bulletin of the National Museum of Ethnology ; Vol. 29, no. 1 - Osaka-JA : National Museum of Ethnology, 2004. - p. 43-70 : maps. - Irregular - Vol. 29, no. 1(2004). - Bulletin of the National Museum of Ethnology ; Vol. 29, no. 1 . - Japón. National Museum of Ethnology. .
Northern Minority Languages. Problems of Survival.
Bulletin of the National Museum of Ethnology ; Vol. 29, no. 1 - Osaka-JA : National Museum of Ethnology, 2004. - p. 43-70 : maps. - Irregular - Vol. 29, no. 1(2004). - Bulletin of the National Museum of Ethnology ; Vol. 29, no. 1 . - Japón. National Museum of Ethnology. .
Northern Minority Languages. Problems of Survival.
