“An Experimental Investigation of Performance and Emission Characteristics of a CI Engine Fuelled With Waste Cooking Methyl Ester and Its Respective Blends With Diesel Fuel”. International Journal of Current Engineering and Technology, vol. 1, no. 5.Special Issue, June 2016, pp. 311-5, https://ijcet.evegenis.org/index.php/ijcet/article/view/4308.