Casting out nines (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Casting out nines" in English language version.

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6^th place

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70^th place

63^rd place

1books.google.com

3^rd place

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archive.org (Global: 6^th place; English: 6^th place)

Heath (1921, pp. 113–117), Hippolytus of Rome (1919, pp. 30–32). Heath, Thomas (1921), A History of Greek Mathematics, vol. I: From Thales to Euclid, Oxford: Oxford University Press
Datta & Singh (1962, pp. 180–184)
Datta & Singh (1962, p. 184)

books.google.com (Global: 3^rd place; English: 3^rd place)

Krantz (2010, pp. 67–70) Krantz, Steven G. (2010), An Episodic History of Mathematics—Mathematical Culture through Problem Solving, The Mathematical Association of America, ISBN 978-0-88385-766-3, LCCN 2010921168

loc.gov (Global: 70^th place; English: 63^rd place)

lccn.loc.gov

Krantz (2010, pp. 67–70) Krantz, Steven G. (2010), An Episodic History of Mathematics—Mathematical Culture through Problem Solving, The Mathematical Association of America, ISBN 978-0-88385-766-3, LCCN 2010921168
Long (1972, p. 83) Long, Calvin T. (1972), Elementary Introduction to Number Theory (2nd ed.), Lexington: D. C. Heath and Company, LCCN 77171950