- Liquefaction and gasification of Estonian oil shales in the medium of hot compressed waterKruusement, Kristjan; Luik, Hans; Luik, Lea; Palu, Vilja; Vink, Natalia; Vogel, FredericInternational Oil Shale Symposium : Tallinn, Estonia, June 8-11, 2009 : future energy solutions : come and share your vision!2009 / p. 42-43 http://www.ester.ee/record=b4775098*est