00455nam a22001577a 450000500170000001000130001702000150003003500130004503700310005808200100008910000230009924500770012226000480019930000220024770000280026920181022165545.0  aA-945455  a8171414249  aA-945455  bDiscovery publishing house  a372.7  aPrabhakaram, K. S.  aConcept attainment model in mathematical teaching/cby K. S. Prabhakaram  aNew DelhibDiscovery publishing housec1998  a101 p.b22cm (HB)  aRao, Digumarti Bhaskara