1. https://mathworld.wolfram.com/SpiderandFlyProblem.html
2. Patrick Honner, The Crooked Geometry of Round Trips, Quantamagazine, 2021, https://www.quantamagazine.org/the-crooked-geometry-of-round-trips-26216113/
3. https://en.wikipedia.org/wiki/Geodesics_on_an_ellipsoid
4. J S Athreya, D Aulicino, W P Hooper with an appendix by Anja Randecker, Platonic solids and high genus covers of lattice surfaces, Experimental Mathematics, Vol.0, pp.1–31, 2020. arXiv: https://arxiv.org/abs/1811.04131v2.
5. S Ghosh, A P Merin and N Nitsure, On the geometric phenomenology of static friction, Journal of Physics: Condensed Matter, Vol.29, p.355001, 2017. arXiv: https://arxiv.org/abs/1762.64545v2.