S. Reyes, Edwin O., and Carlos M. C. Riveros. “Congruence of Geodesic Spheres in H3 and S3”. Selecciones Matemáticas 5, no. 02 (December 30, 2018): 212-229. Accessed July 22, 2024. https://revistas.unitru.edu.pe/index.php/SSMM/article/view/2198.