Annamalai, V. E., C. V. Gokularathnam, R. Krishnamurthy, and B.L. Anantha Ramu. “Ultrasonic Machining As an Aid to Ceramic Etching”. Defence Science Journal 42, no. 1 (January 1, 2013): 63–64. Accessed July 6, 2025. https://publications.drdo.gov.in/ojs/index.php/dsj/article/view/4352.