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International symposium on ‘The Role of Geometry in present-day Mathematics Teaching’ scheduled to be held in Bielefeld (west-Germany) from september 16 to 20, 1974. Educ Stud Math 5, 389 (1974). https://doi.org/10.1007/BF01424558
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DOI: https://doi.org/10.1007/BF01424558