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      <subfield code="a">Giménez, Joaquim</subfield>
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      <subfield code="a">Rosich Sala, Núria</subfield>
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      <subfield code="a">In this paper we present the results of using an interactive geometrical environment, regarding the acquisition of certain mathematical skills by deaf students (12-16 years old). Communication and variability skills are analyzed when the class is organized using computer distance support. We present the main trends of the experiences and formative regulation assessment perspective.</subfield>
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      <subfield code="a">Improving geometry by using dialogic hypermedia tools: A case study</subfield>
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