1. Wilson, J. F. (1971). Practice and theory of electrochemical machining. John Wiley & Sons, pp. 79–83.
2. Terada, A., & Natsu, W. (2010). Improvement of ECM characteristics by removing by-products from gap area with tool motion control. In Proceedings of JSPE 2010 Autumn Meeting, pp. 227–228 (in Japanese)
3. Natsu, W., Nakayama, H., & Yu, Z. (2012). Improvement of ECM characteristics by applying ultrasonic vibration. International Journal of Precision Engineering and Manufacturing, 13(7), 1131–1136.
4. Sharma, K., & Om, J. (2020). A review paper on electro chemical machining. IJARIIE, 6(1), 2395–4396.
5. Kurogi, S., Natsu, W., & Yu, Z. (2012). Investigation of machining characteristics of ultrasonic vibration assisted ECM. Applied Mechanics and Materials, 217–219, 2555–2559.