1. Kepler, J. Harmonices Mundi; Gottfried Tambach: Linz, Austria, 1619; pp 1–255, http://archive.org/details/ioanniskepplerih00kepl.
2. Hales, T.; Kusner, W. Packings of Regular Pentagons in the Plane. arXiv (Mathematics, Metric Geometry), 1602.07220, ver. 2, 13 Sept. 2016. DOI: 10.48550/arXiv.1602.07220 (accessed March 13, 2021).
3. Monte Carlo study of hard pentagons