Tartu Ülikool2026-04-012026-04-011984ARH PT-1753https://hdl.handle.net/10062/119970etAttribution-NonCommercial-NoDerivs 3.0 Estoniahttps://creativecommons.org/licenses/by-nc-nd/3.0/ee/pisitrükisedküsimustikudtulevikuootusedOther