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Research in Social Stratification and Mobility > 2012 > 30 > 3 > 310-327
World Patent Information > 2003 > 25 > 4 > 289-302
Research in Social Stratification and Mobility > 2012 > 30 > 3 > 310-327
World Patent Information > 2003 > 25 > 4 > 289-302