World Development
World Development > 2000 > 28 > 4 > 721-737
World Development > 2000 > 28 > 9 > 1611-1626
World Development > 2000 > 28 > 10 > 1805-1819
World Development > 2000 > 28 > 4 > 721-737
World Development > 2000 > 28 > 9 > 1611-1626
World Development > 2000 > 28 > 10 > 1805-1819