This certificate confirms that the paper "An Experimental and Analytical Study of Emission Characteristics of a Diesel Engine Fuelled With Cotton Seed Oil Methyl Ester and Petro-Diesel for Different Static Injection Timings" by author G. Jagadeeshkumar has been published in the International Journal of Research in Engineering and Science. The paper was published online and in print in Volume 2, Issue 5 of the journal for May 2014.