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100   $a20090511d1998----km-y0itay50------ba
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102   $aZA
105   $aa---a---001yy
200 1 $aProceedings of the 22° conference of the international group for the psycology of mathematics education 12-17 July 1998$fEditors: Alwin Olivier, Karen Newstead
210   $aStellenbosch$cUniversity of Stellenbosch$dc1998
215   $a4 v.$d21 cm
225 1 $aPsychology of Mathematics Education$v22
610 0 $aEducazione matematica
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702  1$aOlivier,$bAlwyn
702  1$aNewstead,$bKaren
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