• Economic, scientific and technical outlook for oil shale retorting activities within the coal to liquids strategic context in EuropeJakobson, Indrek; Siirde, AndresInternational Oil Shale Symposium : Tallinn, Estonia, June 8-11, 2009 : future energy solutions : come and share your vision!2009 / p. 106 http://www.ester.ee/record=b4775098*est