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International Journal of Industrial Organization > 2010 > 28 > 3 > 213-219
International Journal of Industrial Organization > 2005 > 23 > 3-4 > 203-225
International Journal of Industrial Organization > 2010 > 28 > 3 > 213-219
International Journal of Industrial Organization > 2005 > 23 > 3-4 > 203-225