• Current status of oil shale processing in solid heat carrier UTT (Galoter) retorts in EstoniaÖpik, Ilmar; Golubev, N.; Kaidalov, A.; Kann, Jüri; Elenurm, AlfredOil shale2001 / p. 99-108 : ill https://www.ester.ee/record=b1072685*est https://artiklid.elnet.ee/record=b1007234*est