- RePEc:apr:aprewp:wp2008-02
- RePEc:aub:autbar:749.08
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- RePEc:cns:cnscwp:200809
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- RePEc:fip:fedpwp:08-12
- RePEc:fpr:polbrf:1ach
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- RePEc:ide:wpaper:9291
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- RePEc:lat:legeco:2008-02
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