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An approach with the help of a geometric figure in grade 5 and grade 6. Geometrie une approche par le dessin geometrique cm2 - sixieme. Einstieg ueber eine geometrische Figur in den Klassen 5 und 6. (French)
Bull. A.P.M.E.P. (Dec 1989) v. 68(371) p. 659-669. [ISSN 0240-5709]
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