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Selection bias in innovation studies : a simple test
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The Knowledge Production of 'R' and 'D'
Diversity of science linkages and innovation performance: some empirical evidence from Flemish firms
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Diversity of science linkages: A survey of innovation performance effects and some evidence from Flemish firms
Diversity of science linkages and innovation performance : some empirical evidence from Flemish firms
Quantity or quality? Collaboration strategies in research and development and incentives to patent