00390nam a2200121Ia 4500003000400000008004100004040000800045100002500053245008200078260003400160300001500194440005900209LDD181029s9999    xx            000 0 und d  cLDD  aHiele, Pierre M. Van 0aStructure and insightba theory of mathematics educationcPierre M. Van Hiele  aOrlandobAcademic Pressc1986  aviii, 246p  aDevelopmental psychology series edited by Harry Beilin