• Characteristic numbers of primary control in the isolated Estonian power systemMedvedeva-TÅ¡ernobrivaja, Viktoria; Attikas, Raivo; Tammoja, HeikiOil shale2011 / 1S, p. 214-222 : ill https://www.airitilibrary.com/Article/Detail/17367492-201103-201104080003-201104080003-214-222 https://artiklid.elnet.ee/record=b2286676*est