The 5 references without contexts in paper Christopher F Baum, Hans Lööf, Pardis Nabavi (2015) “Innovation Strategies, External Knowledge and Productivity Growth” / RePEc:boc:bocoec:885

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Johansson, B. and H. Lööf (2014). Innovation strategies combining internal and external knowledge.Routledge Handbook of the Economics of Knowledge, 29–52.
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Lööf, H. and B. Johansson (2014). R&D Strategy, Metropolitan Externalities and Productivity: Evidence from Sweden.Industry and Innovation 21(2), 141–154.
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34
Dynamic R & D Demand : An Analysis of Costs and Long-Run Benefits Introduction - Linking R & D and Firm Performance.NEBR Working paper(No. w19374).
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International Business Studies 39(5), 901–919.
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Research Policy 19(2), 165–174.
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