Dr. Karthik M, Nandhakumar T, and Dr. Usha S. “Analysis of Emission and Fuel Economy in a Plug in Hybrid Vehicle Using Various Control Strategies”. Journal of Power Electronics and Devices, vol. 1, no. 1, Jan. 2016, pp. 1-11, http://matjournals.co.in/index.php/JOPED/article/view/6513.