World Development
World Development > 2000 > 28 > 1 > 129-142
World Development > 2000 > 28 > 5 > 879-891
World Development > 2000 > 28 > 7 > 1379-1390
World Development > 2000 > 28 > 1 > 129-142
World Development > 2000 > 28 > 5 > 879-891
World Development > 2000 > 28 > 7 > 1379-1390