Petunin, Yu. I., and Rublev В. V. “Minimum-Area Ellipse Containing a Finite Set of Points. I”. Ukrains’kyi Matematychnyi Zhurnal 50, no. 7 (July 25, 1998): 980–988. Accessed December 6, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4877.