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Communication at the First International Congress on Mathematical Education, Lyon, 24=2–30 August, 1969.
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Egsgard, J.C. Some ideas in geometry that can be taught from K-6. Educ Stud Math 2, 478–495 (1970). https://doi.org/10.1007/BF00417630
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DOI: https://doi.org/10.1007/BF00417630