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Estonian Academy of Sciences year book 2000Engelbrecht, Jüri2001 https://www.ester.ee/record=b1218154*est

Estonian Academy of Sciences year book 2002Engelbrecht, Jüri2003 https://www.ester.ee/record=b1218154*est

Estonian Academy of Sciences year book 2005Mõtus, Leo2006 https://www.ester.ee/record=b1218154*est