Y. Gultekin, Selin, et al. “Comparison of Solid Biofuels Produced from Olive Pomace With Two Different Conversion Methods: Torrefaction and Hydrothermal Carbonization”. International Journal of Engineering & Technology, vol. 7, no. 2.23, Apr. 2018, pp. 143-7, https://doi.org/10.14419/ijet.v7i2.23.11903.