REFERENCES
- H. S. M. Coxeter, Regular Polytopes, Dover, New York, 1973.
- D. M. Y. Sommerville, An Introduction to the Geometry of n Dimensions, Dover, New York, 1983.
- H. Steinhaus, One Hundred Problems in Elementary Mathematics, Dover, New York, 1979.
- D. Struik, A Concise History of Mathematics, 4th ed., Dover, New York, 1987.