References
- Bogomolny, A. (2018). Interactive mathematics miscellany and puzzles. Carpets in hexagon. www.cut-the-knot.org/triangle/CarpetsInHexagon.shtml
- Casey, J. (1889). A Treatise on Spherical Trigonometry, and Its Application to Geodesy and Astronomy, with Numerous Examples. Dublin: Hodges, Figgis, & Company.
- Frenkel, E. (2018). On area and volume in spherical and hyperbolic geometry. Ph.D. dissertation. Université de Strasbourg, Strasbourg, France.
- Todhunter, I. (1886). Spherical Trigonometry: For the Use of Colleges and Schools, 5th ed. London: MacMillan and Co.