Cherry Dhiman and Ayushi Paliwal and Mohd. Shahid Khan and M. N. Reddy and Vinay Gupta and Monika Tomar, Detailed Sensitive Detection of Impurities in Waste Engine Oils Using Laser Induced Breakdown Spectroscopy, Rotating Disk Electrode Optical Emission Spectroscopy and Surface Plasmon Resonance. journal = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology. June 2019, vol. 151(7). 167 - 172 [viewed 07 March 2021]. Available from: https://publications.waset.org/pdf/10010582.