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• Characterization of oil shale ashes formed at industrial-scale CFBC boilersKuusik, Rein, keemik; Uibu, Mai; Kirsimäe, KalleOil shale2005 / 4S, p. 407-419 : ill https://artiklid.elnet.ee/record=b2352613*est
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• The CO2-binding by Ca-Mg-silicates in direct aqueous carbonation of oil shale ash and steel slagUibu, Mai; Kuusik, Rein, keemik; Andreas, Lale; Kirsimäe, KalleEnergy procedia2011 / p. 925-932 : ill https://www.researchgate.net/publication/251711714_The_CO_2_-binding_by_Ca-Mg-silicates_in_direct_aqueous_carbonation_of_oil_shale_ash_and_steel_slag
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• Two hundred years of geology education in EstoniaEstonian journal of earth sciences2020 / p. 175-176 https://kirj.ee/wp-content/plugins/kirj/pub/earth-4-2020-175-176_20201116140304.pdf http://www.ester.ee/record=b2246661*est
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