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ISSN:0002-8282|97|4|1278-1304

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ISSN:0002-8282|99|2|522-526

American Economic Association‎(2009)‎

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By Ham John C   LaLonde Robert J   in International Journal of Manpower

ISSN:0143-7720|15|5|32-37

Emerald Group Publishing Ltd‎(1994)‎

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