Kurniasih, Neny, Naoshi Nishimura, and Shoichi Kobayashi. “Determination of Location and Size of Circular Cavity Using Nonlinear Programming Techniques”. Indonesian Journal of Physics 12, no. 3 (October 31, 2016): 57-60. Accessed April 3, 2025. https://ijphysics.fi.itb.ac.id/index.php/ijp/article/view/13.