Janne Saarikivi: Substrata Uralica. Studies in Finno-Ugric substrate in northern Russian dialects. Doctoral dissertation. Tartu 2006: 28 (online textArchived 2017-08-30 at the Wayback Machine)
Janne Saarikivi: Substrata Uralica. Studies in Finno-Ugric substrate in northern Russian dialects. Doctoral dissertation. Tartu 2006: 28 (online textArchived 2017-08-30 at the Wayback Machine)