Bibliography
Harkin, J. B., ‘The Limit Concept on the Geoboard’,Mathematics Teacher 65 (January 1972) 13–17.
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Harkin, J.B. Transformation and tesselation on the geoboard. Educ Stud Math 5, 461–465 (1974). https://doi.org/10.1007/BF00684715
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DOI: https://doi.org/10.1007/BF00684715