Väljako, Kristo2023-05-122023-05-122021-07-21http://hdl.handle.net/10062/89767engopenAccessAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/ringidlaiendidMorita ekvivalentsusEnlargements of ringsPresentation