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Groen, G., An Investigation of Some Counting Algorithms for Simple addition Problems. Technical Report No. 118, August 21, 1967, Stanford University, Institute for Mathematical Studies in the Social Sciences.
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This research was supported by the National Science Foundation and the United States Office of Education. The author is indebted to Dr. Patrick Suppes, principal investigator, for permission to use the data reported here.
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Jerman, M. A counting model for simple addition. Educ Stud Math 2, 438–445 (1970). https://doi.org/10.1007/BF00417626
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DOI: https://doi.org/10.1007/BF00417626