E. Ö. Canfes and A. Özdeğer, “A characterization of totally umbilical hypersurfaces of a space form by geodesic mapping”, Ukr. Mat. Zhurn., vol. 65, no. 4, pp. 583–587, Apr. 2013, Accessed: Apr. 16, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2441