Polder, Michael and Veldhuizen, Erik and Bergen, Dirk van den and Pijll, Eugène van der (2009): Micro and macro indicators of competition: comparison and relation with productivity change.
Polder, Michael and Leeuwen, George van and Mohnen, Pierre and Raymond, Wladimir (2009): Productivity effects of innovation modes.
Polder, Michael and Van Leeuwen, George and Mohnen, Pierre and Raymond, Wladimir (2010): Product, process and organizational innovation: drivers, complementarity, and productivity effects.
Van Leeuwen, George and Polder, Michael (2013): Linking ICT related Innovation Adoption and Productivity: results from micro-aggregated data versus firm-level data.
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