S, F. and H, S. (2010) “USING DIRECT RITZ METHOD FOR SOLVING ELECTROCHEMICAL MACHINING MOVING BOUNDARY PROBLEM”, Al-Nahrain Journal of Science, 13(4), pp. 199–204. Available at: https://anjs.edu.iq/index.php/anjs/article/view/1007 (Accessed: 22 May 2026).