Underground Positioning: Subway Information System Using WiFi Location Technology. - Nobuo Kawaguchi; Motoki Yano; Shogo Ishida; Takeshi Sasaki; Yohei Iwasaki; Kenji Sugiki; Shigeki Matsubara (Mobile Data Management, 2009)

TimeTable.Locky: nation wide WiFi location information system based on user contributed information. - Motoki Yano; Katsuhiko Kaji; Nobuo Kawaguchi (LocWeb, 2010)