• Assessment of the environmental impact of oil shale excavation in estonian geological conditionsSabanov, Sergei; Sokman, Kalmer; Lind, Helena15th Meeting of the Association of European Geological Societies "Georesources and public policy : research, management, environment" : 16-20 September 2007, Tallinn, Estonia : abstracts2007 / p. 60 https://www.ester.ee/record=b2291667*est