B., Madhava Varma, et al. “An Experimental Investigation of Vibration Characteristics of Compression Ignition Engine Running With Neem Methyl Ester”. International Journal of Automotive and Mechanical Engineering, vol. 13, no. 2, Dec. 2022, pp. 3434-50, https://doi.org/10.15282/ijame.13.2.2016.12.0284.