World Development
World Development > 2003 > 31 > 6 > 997-1013
World Development > 2003 > 31 > 8 > 1367-1384
World Development > 2003 > 31 > 9 > 1495-1510
World Development > 2003 > 31 > 6 > 997-1013
World Development > 2003 > 31 > 8 > 1367-1384
World Development > 2003 > 31 > 9 > 1495-1510