“An Experimental Investigation on NOx Emission Reduction and Performance Evaluation of CI Engine Using EGR System”. International Journal of Engineering Research and Advanced Technology (ijerat) (E-ISSN 2454-6135) DOI: 10.31695 IJERAT, vol. 3, no. 7, July 2017, pp. 01-16, https://doi.org/10.7324/IJERAT.2017.32475.