1. A.D. Aleksandrov, A theorem on triangles in a metric space and some of its applications, in Trudy Mat. Inst. Steklov., v 38, Trudy Mat. Inst. Steklov., v 38 (Izdat. Akad. Nauk SSSR, Moscow, 1951), pp. 5–23
2. E.M. Andreev, Convex polyhedra in Lobačevskiı̆ spaces. Mat. Sb. (N.S.) 81(123)(123), 445–478 (1970)
3. Aristotle, On the heavens. Translated by J. L. Stocks, The Internet Classics Archive (2009)
4. M. Awartani, D.W. Henderson, Spaces of geodesic triangulations of the sphere. Trans. Am. Math. Soc. 304(2), 721–732 (1987)
5. C.J. Bishop, Uniformly acute triangulations of polygons (2021). preprint. Available at https://www.math.stonybrook.edu/~bishop/papers/acutepoly.pdf