Nguyen, Doan Tuan, and Duc Quang Si. “On the Relation Between Curvature, Diameter, and Volume of a Complete Riemannian Manifold”. Ukrains’kyi Matematychnyi Zhurnal 56, no. 11 (November 25, 2004): 1576–1583. Accessed May 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3867.