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Translated from Matematika v Ŝkole, 1970, No. 1, 13–22.
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Semušin, A.D. Study of geometry in the fourth grade. Educ Stud Math 3, 68–83 (1970). https://doi.org/10.1007/BF00381595
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DOI: https://doi.org/10.1007/BF00381595