Items where Author is "Helmers, Christian"
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Hall, Bronwyn and Helmers, Christian and Rogers, Mark and Sena, Vania (2014) The Choice between Formal and Informal Intellectual Property: A Review. Journal of Economic Literature, 52 (2). pp. 375-423. DOI https://doi.org/10.1257/jel.52.2.375
Hall, Bronwyn H and Helmers, Christian and Rogers, Mark and Sena, Vania (2013) The importance (or not) of patents to UK firms. Oxford Economic Papers, 65 (3). pp. 603-629. DOI https://doi.org/10.1093/oep/gpt012