?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Duong%2C+Ngoc+Son&rft.aulast=Duong&rft.aufirst=Ngoc+Son&rft.date=March+2021&rft.title=On+the+accuracy+of+iBeacon-based+Indoor+Positioning+System+in+the+iOS+platform&rft.genre=proceeding