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References
- ↑ Cajori, Florian (1919). A History of Mathematics. Macmillan. p. 157.
cajori william-oughtred multiplication.
- ↑ Pycior, Helena Mary (1997). Symbols, Impossible Numbers, and Geometric Entanglements: British Algebra through the Commentaries on Newton's Universal Arithmetick. p. 48. ISBN 0-521-48124-4.
- ↑ Hubbard, Frank (1967).