Rao, G. , Sampath, S. , Rajagopal, K.. "Experimental Studies on the Combustion and Emission Characteristics of a Diesel Engine Fuelled with Used Cooking Oil Methyl Esterand its Diesel Blends". World Academy of Science, Engineering and Technology, Open Science Index 13, International Journal of Mechanical and Mechatronics Engineering, (2008), 2(1), 90 - 96.