Gangwar, S. ., and D. P. S. . Rao. “MINIMUM QUANTITY LUBRICATION (MQL) DURING CONVENTIONAL MACHINING OPERATIONS: A REVIEW”. International Journal of Technical Innovation in Modern Engineering & Science, vol. 5, no. 4, Apr. 2019, pp. 41-46, https://ijtimes.com/IJTIMES/index.php/ijtimes/article/view/2729.