Yifei Jiang Xin Pan Kun Li Qin Lv Robert P. Dick Michael Hannigan Li Shang ARIEL: automatic wi-fi based room fingerprinting for indoor localization. 441-450 2012 UbiComp https://doi.org/10.1145/2370216.2370282 conf/huc/2012 db/conf/huc/ubicomp2012.html#JiangPLLDHS12