?url_ver=Z39.88-2004&rft_id=doi%3A10.3390%2Fs20020405&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Ta%2C+Viet+Cuong&rft.aulast=Ta&rft.aufirst=Viet+Cuong&rft.issue=2&rft.volume=20&rft.date=10+January+2020&rft.issn=1424-8220&rft.atitle=Collaborative+Smartphone-Based+User+Positioning+in+a+Multiple-User+Context+Using+Wireless+Technologies&rft.title=Sensors&rft.genre=article