[1]
A. Elbadawi, S. Suliman, H. Elkhair, H. Abuelhassan, and M. Sabahelkhier, “Recycling edible vegetable oils by using various types of alkali with alcohol to produce biodiesel and study its optical and physical properties”, Int. J. Environ., vol. 3, no. 2, pp. 143–149, May 2014.