加号与减号 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "加号与减号" in Chinese language version.

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2web.archive.org

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1findarticles.com

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archive.org

Ley, Willy. Symbolically Speaking. For Your Information. Galaxy Science Fiction. April 1965: 57–67.

findarticles.com

Stallings, Lynn. A brief history of algebraic notation. School Science and Mathematics. May 2000 [13 April 2009]. （原始内容存档于2010-01-06）.

mdx.ac.uk

eprints.mdx.ac.uk

Sangster, Alan; Stoner, Greg; McCarthy, Patricia. The market for Luca Pacioli’s Summa Arithmetica (PDF). Accounting Historians Journal. 2008, 35 (1): 111–134 [p. 115] [2018-07-16]. （原始内容存档 (PDF)于2018-01-26）.

web.archive.org

Stallings, Lynn. A brief history of algebraic notation. School Science and Mathematics. May 2000 [13 April 2009]. （原始内容存档于2010-01-06）.
Sangster, Alan; Stoner, Greg; McCarthy, Patricia. The market for Luca Pacioli’s Summa Arithmetica (PDF). Accounting Historians Journal. 2008, 35 (1): 111–134 [p. 115] [2018-07-16]. （原始内容存档 (PDF)于2018-01-26）.