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Procedural and relational aspects of algebraic thinking. Prozedurale und relationale Aspekte algebraischen Denkens. (English)
Proceedings of the fifteenth PME conference. Vol. 1. Proceedings der fuenfzehnten PME-Konferenz. Bd. 1. Editor(s): Furinghetti, F. International Group for the Psychology of Mathematics Education 1991. p. 80-87 of 364 p. Available from Genoa Univ. (Italy). Dipt. di Matematica. Conference: Fifteenth PME conference, Assisi (Italy), 29 Jun - 4 Jul 1991
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