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Ashcraft, MH and Christy, KS (1995). The Frequency of Arithmetic Facts in Elementary Texts: Addition and Multiplication in Grades 16. Journal for Research in Mathematics Education 26(5), pp. 396421.





Benford, F (1938). The law of anomalous numbers. Proceedings of the American Philosophical Society, Vol. 78, No. 4 (Mar. 31, 1938), pp. 551572.





Zbrodoff, NJ (1995). Why is 9+7 harder than 2+3  Strength and Interference as Explanations of the ProblemSize Effect. Memory & Cognition 23(6), 689700. ISSN/ISBN:0090502X. DOI:10.3758/BF03200922.




