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200 1 $aProceedings of the 21st conference of the international group for the Psychology of Mathematics Education$fedited by Erkki Pehkonen
210   $aHelsinki$cUniversity of Helsinki$d1997
215   $a4 v.$d21 cm
225 1 $aPsychology of mathematics education$v21
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996   $aProceedings of the 21st conference of the international group for the Psychology of Mathematics Education$9769462
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