?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Dinh%2C+Thi+Thai+Mai&rft.aulast=Dinh&rft.aufirst=Thi+Thai+Mai&rft.date=April+2020&rft.issn=1558-1748&rft.atitle=Smartphone-based+Indoor+Positioning+Using+BLE+iBeacon+and+Reliable+Lightweight+Fingerprint+Map&rft.title=IEEE+Sensors+Journal&rft.pages=1-12&rft.genre=article