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doi.org
Katz, Victor J.; Barton, Bill (October 2007), "Stages in the History of Algebra with Implications for Teaching", Educational Studies in Mathematics, 66 (2): 185–201, doi:10.1007/s10649-006-9023-7
worldcat.org
Jeffrey A. Oaks, Haitham M. Alkhateeb, Simplifying equations in Arabic algebra, Historia Mathematica, 34 (2007), 45-61, ISSN0315-0860, [1]