?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Hoang%2C+Manh+Kha&rft.aulast=Hoang&rft.aufirst=Manh+Kha&rft.date=18+October+2017&rft.title=Enhancing+WiFi+based+Indoor+Positioning+by+Modeling+Measurement+Data+with+GMM&rft.genre=proceeding