Laith H. M. Al-Ossmi, and Nesreen Kurdy Al-Obaidy. “Measuring Curvature Method for the Exact Value of the Ellipse Perimeter”. Eurasian Journal of Physics,Chemistry and Mathematics, vol. 20, July 2023, pp. 27-44, https://geniusjournals.org/index.php/ejpcm/article/view/4695.