Gaidamaško, R. (2013) “Finno-Ugric substrate appellatives in Russian dialects of the Upper Kama”, Eesti ja soome-ugri keeleteaduse ajakiri. Journal of Estonian and Finno-Ugric Linguistics. Tartu, Estonia, 4(2), pp. 199–216. doi: 10.12697/jeful.2013.4.2.11.