Viitso, T.-R. “Expressions of Obligation, Duty, and Necessity in Livonian”. Eesti Ja Soome-Ugri Keeleteaduse Ajakiri. Journal of Estonian and Finno-Ugric Linguistics, Vol. 5, no. 1, July 2014, pp. 193-14, doi:10.12697/jeful.2014.5.1.10.