By Pantziara Marilena   Gagatsis Athanasios   Elia Iliada   in Educational Studies in Mathematics

ISSN:0013-1954|72|1|39-60

Springer Publishing Company ‎(2009)‎

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By Panaoura Areti   Gagatsis Athanasios   Deliyianni Eleni   Elia Iliada   in Educational Psychology

ISSN:1469-5820|29|6|713-728

Routledge Ltd‎(2009)‎

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