Tiikma, L., Johannes, I., Luik, H., Zaidentsal, A., Vink, N. Thermal dissolution of Estonian oil shale // Advances in Analytical and Applied Pyrolysis 2006-2008 : book of abstracts of the communications presented to the 18th International Symposium on Analytical and Applied Pyrolysis : Lanzarote, Canary Islands, May 18-23, 2008., 2008. p. 265.