1
Published: c2010.
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2
Published: c2008.
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3
Published: c2006.
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4
Published: c2010.
Superior document: World Bank working paper, no. 188
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5
Published: 2012.
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6
Published: c2009.
Superior document: World Bank working paper ; no. 156
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7
Published: 2008.
Superior document: World Bank working paper, no. 14
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8
Published: c2007.
Superior document: World Bank working paper, no. 99
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9
Published: c2007.
Superior document: World Bank working paper, no. 100
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10
Published: c2007.
Superior document: World Bank working paper ; no. 122
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11
Published: c2009.
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12
Published: 2013.
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13
Published: c2009.
Superior document: World Bank working paper ; no. 168
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14
Published: c2009.
Superior document: World Bank working paper, no. 173
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15
Published: c2007.
Superior document: World Bank working paper, no. 101
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