1. K. Brendow, “Global oil shale issues and perspectives. Synthesis of the symposium on oil shale,” Oil Shale 20, 81–92 (2003).
2. A. Ots, Oil Sale Fuel Combustion (Tallinn, 2004).
3. A. Ots, “Formation and emission of compounds affecting environment,” Oil Shale 22, 499–535 (2005).
4. T. Pihu, H. Arro, A. Prikk, T. Parve, and J. Loosaar, “Combustion experience of Estonian oil shale in large power plants,” in Proc. Int. Conf. on Oil Shale: “Recent Trends in Oil Shale”. Amman, Jordan, 2006.
5. V. T. Sidorkin, A. N. Tugov, V. A. Vereshchetin, and D. A. Mel’nikov, “Assessment of combustion of oil shale refinery by-products in a TP-101 boiler,” Therm. Eng. 62, 271–277 (2015). DOI: 10.1134/S0040363615040098