Comparison of oil shales from different deposits : oil shale pyrolysis and co-pyrolysis with ashOja, Vahur; Elenurm, Alfred; Rohtla, Ilme; Tali, Enn; Tearo, Eduard; Yanchilin, AlexeyOil shale2007 / 2, p. 101-108 https://artiklid.elnet.ee/record=b2374389*est