• Oil shale reserves in EstoniaTammeoja, Tauno; Loko, Margus; Valgma, Ingo; Karu, Veiko; Tohver, Tarmo4th International Symposium Topical Problems of Education in the Field of Electrical and Power Engineering. Doctoral School of Energy and Geotechnology : Kuressaare, Estonia, January 15-20, 20072007 / p. 94-95