Volenec, V., J. Beban-Brkić, and M. Šimć. “The Cyclic Quadrangle in the Isotropic Plane”. Sarajevo Journal of Mathematics 7, no. 2 (June 10, 2024): 265–275. Accessed November 23, 2024. https://sjm.anubih.ba/index.php/sjm/article/view/295.