?url_ver=Z39.88-2004&rft_id=10.1371%2Fjournal.pone.0233278&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=S.&rft.au=Hafeez%2C+S.&rft.aulast=Hafeez&rft.volume=15&rft.issn=19326203&rft.issue=5&rft.atitle=Innovation+in+Chinese+internet+companies%3A+A+meta-frontier+analysis&rft.title=PLoS+ONE&rft.date=2020&rft.genre=article