00379nam a2200121Ia 4500003000400000008004100004040000800045100001900053245010100072260002400173300000800197440005200205LDD181029s9999    xx            000 0 und d  cLDD  aMorris, Robert 0aStudies in mathematics educationbthe mathematical education of primary- school tcRobert Morris  aParisbUnescoc1984  a258  aThe teaching of basic sciences mathematicsvV.3