Reducing of carbon dioxide emissions at oil shale ash depositionPihu, Tõnu; Arro, Hendrik; Konist, Alar; Kuusik, Rein, keemik; Prikk, Arvi; Uibu, MaiInternational Oil Shale Symposium : Tallinn, Estonia, June 8-11, 2009 : future energy solutions : come and share your vision!2009 / p. 49-50 http://www.ester.ee/record=b4775098*est