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Put under the magnifying glass: analytic geometry for 14-16 years old pupils. Onder de loep genomen: Analytische meetkunde in de tweede graad. Unter die Lupe genommen: Analytische Geometrie fuer 14-16jaehrige Schueler. (Dutch)
Uitwiskeling. (Feb 1990) v. 6(2) p. 22-50.
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