D. T. Nguyen and D. Q. Si, “On the Relation between Curvature, Diameter, and Volume of a Complete Riemannian Manifold”, Ukr. Mat. Zhurn., vol. 56, no. 11, pp. 1576–1583, Nov. 2004, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3867