M. N. A. Yaakob and R. Roslan, “The Extraction of Lignin from Empty Fruit Bunch Fiber via Microwave-Assisted Deep-Eutectic Solvent Heating: Extraction of Lignin from Empty Fruit Bunch Fiber via Microwave-Assisted Deep-Eutectic Solvent Heating”, Curr. Sci. Technol., vol. 1, no. 2, pp. 18–25, Dec. 2021.