CSIMA, G.; SZIRMAI, J. Isoptic curves of generalized conic sections in the hyperbolic plane. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 12, p. 1684–1698, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2287. Acesso em: 5 dec. 2025.