00329nam a2200121Ia 450000500170000000800410001704100080005808200160006610000210008224500530010326000420015630000090019820260720174645.0260720s2006    xx            000 0 und d  aeng  a370.78 PRAC  aPrabhakaram, K S  aConcept attainment model in mathematics teaching  aNew DelhibDiscovery Publishersc2006  a101p