Mehta, A. ., P. S. . Rao, and B. . Singh. “OPTIMIZATION OF MACHINING PARAMETERS USING ROTARY ULTRASONIC MACHINING OF BRITTLE MATERIAL: A REVIEW”. International Journal of Technical Innovation in Modern Engineering & Science, vol. 5, no. 5, May 2019, pp. 1134-8, https://ijtimes.com/index.php/ijtimes/article/view/2692.