イライシャ・グレイ
↑ Evenson 2000, p. 100.
↑ Baker 2000, pp. 90–91.
↑ Evenson 2000, pp. 167–171.
↑ Evenson 2000, pp. 92, 180.
↑ Evenson 2000, pp. 73–74.
↑ Principles of Pulse Code Modulation. New York, USA: American Elsevier. (1969). ISBN 0-444-19747-8
↑ Cogwheels of the Mind: The Story of Venn Diagrams. Baltimore, Maryland, USA: Johns Hopkins University Press. (2004). pp. 48, 50. ISBN 0-8018-7434-3. https://books.google.com/books?id=7_0Thy4V3JIC&pg=PA65
↑ “Generating all n-tuples”. The Art of Computer Programming, Volume 4A: Enumeration and Backtracking. pre-fascicle 2a. (2004-10-15). http://www-cs-faculty.stanford.edu/~knuth/fasc2a.ps.gz