Listar Volumen 2 por financiación "I want to thank the members of the CERME 5 discussion group “Algebraic Thinking”, especially the reviewers of an earlier version of this paper, as well as Rebecca Ambrose, for all their comments which contributed to the improvement of this paper. This study has been developed within a Spanish national project of Research, Development and Innovation, identified by the code SEJ2006-09056, financed by the Spanish Ministry of Sciences and Technology and FEDER funds."
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