Krishna Prasad S, R Saravanan. “The Study of Impact of Compression Ratio on the Performance and Emission Characteristics of DTSi Engine Using Petrol and CNG As Fuel”. PalArch’s Journal of Archaeology of Egypt / Egyptology, vol. 17, no. 9, Nov. 2020, pp. 1266 -77, https://archives.palarch.nl/index.php/jae/article/view/3748.