A. Sama-Ae, A. Phon-on, N. Makaje, A. Hazanee, and P. Riyapan, “Some Characterizations of a Closed Geodesic Polygon and a Closed Spherical Curve in a CAT(k) Space: Annual Meeting in Mathematics 2024”, Thai J Math, vol. 23, no. 1, pp. 185–196, Mar. 2025.