H. H. Al-Kayiem, and Y. Md Yunus. “Drying of Empty Fruit Bunches As Wasted Biomass by Hybrid Solar–Thermal Drying Technique”. Journal of Mechanical Engineering and Sciences, vol. 5, no. 1, Dec. 2013, pp. 652-61, doi:10.15282/jmes.5.2013.12.0063.