Publications

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2008
Heeffer, Albrecht. 2008. Negative Numbers As An Epistemic Difficult Concept. Some Lessons From History.. In History and Pedagogy of Mathematics. Satellite Meeting of International Congress on Mathematical Education 11, 14 - 18 July 2008., History and Pedagogy of Mathematics. Satellite Meeting of International Congress on Mathematical Education 11, 14 - 18 July 2008., C. Tzanakis. Centro Cultural del México Contemporanéo.