Devendra Vashist, Naveen Kumar & Manu Bindra 2017. Technical Challenges in Shifting from BS IV to BS-VI Automotive Emissions Norms by 2020 in India: A Review. Archives of Current Research International. 8, 1 (Jun. 2017), 1–8. DOI:https://doi.org/10.9734/ACRI/2017/33781.