?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=G.&rft.au=Zhang%2C+G.&rft.aulast=Zhang&rft.title=Collaborative+Invention+and+Knowledge+Diffusion%3A+Evidence+from+Co-patents+of+Artificial+Intelligence+in+Europe&rft.tpages=39&rft.date=2022&rft.degree=Master