01198nam0-2200349-i-450-99000928464040332120101123152919.0000928464FED01000928464(Aleph)000928464FED0100092846420101123d1993----km-y0itay50------baengJPa---a---101yyProceedings of the International Conference on the Psychology of mathematics education, PME XVII, Tsukuba, Japan, July 18-23, 1993Ichiei Hirabayashi ... [et al.] editorsTsukubaUniversity of Tsukuba19933 v.22 cmPsycology of mathematics education17Educazione matematica372.721itaHirabayashi,IchieiITUNINAREICATUNIMARCBK990009284640403321CPDM-97-093-(1216MA1CPDM-97-093-(2217MA1CPDM-97-093-(3218MA1MA197-XXProceedings of the International Conference on the Psychology of mathematics education, PME XVII, Tsukuba, Japan, July 18-23, 1993769209UNINA