CHEN, Junfeng, and Shichang SHU. “Compact Hypersurfaces in a Locally Symmetric Manifold”. Studia Universitatis Babeș-Bolyai Mathematica 61, no. 1 (March 30, 2016): 95–108. Accessed February 11, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5521.