References
- Eves, H.: A Survey of Geometry, Revised Edition. Allyn and Bacon, Inc., Boston, 1972.
- Federico, P. J.: Descartes on Polyhedra: A Study of the De Solidorum Elementis. Springer, New York, 1982.
- Hilton, P. & Pedersen, J.: Descartes, Euler, Poincare, Polya. Enseign. Math. 27 (1981), 327-343.
- Hilton, P. & Pedersen, J.: The Euler Characteristic and Polya's Dream. Amer. Math. Monthly 103 (1996), 121-131. https://doi.org/10.2307/2975104
- Polya, G.: Mathematical Discovery, Combined Edition. John Wiley and Sons, Inc., New York, 1981.