1. Multiple Regression: Testing and Interpreting Interaction;Aiken,1991
2. Organizational Learning: Creating, Retaining, and Transferring Knowledge;Argote,1999
3. Economic welfare and the allocation of resources for invention;Arrow,1962
4. First- and second-order additionality and learning outcomes in collaborative R&D programs;Autio;Research Policy,2008
5. Indirect effects of large-scale technological development programmes;Bach,1997