00373nam a2200133Ia 450000500170000000800410001702000180005804000100007605000170008610000190010324500500012226000380017265000290021020251229190358.0251229s9999    xx            000 0 und d  a9780821366882  cEULIB  aLB 1060 .A23  aAbadzi, Helen. 0aEfficient learning for the poorcHelen Abadzi  aWashington D.Cb World Bankc1990  aLearning, Psychology Of.