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References
- ↑ Konhauser, Joseph D. E.; Daniel J. Velleman; S. Wagon (1996). Which way did the bicycle go?: and other intriguing mathematical mysteries. Cambridge University Press. p. 105. ISBN 978-0-88385-325-2.
- ↑ Niederman, Derrick (2009). Number freak: from 1 to 200— the hidden language of numbers revealed. Penguin. p. 63. ISBN 978-0-399-53459-1.
- ↑ Knecht, Craig; Walter Trump; Daniel ben-Avraham; Robert M. Ziff (2012). "Retention capacity of random surfaces". Physical Review Letters. 108 (4): 045703. arXiv: 1110.6166 . Bibcode:2012PhRvL.108d5703K. doi:10.1103/PhysRevLett.108.045703. PMID 22400865.
- ↑ Notes on Magic Squares and Cubes by Walter Trump
