![Measuring fine-grained metro interchange time via smartphones]()
Measuring fine-grained metro interchange time via smartphonesGu, Weixi; Zhang, Kai; Zhou, Zimu; Jin, Ming; Zhou, Yuxun; Liu, Xi; Spanos, Costas J.; Shen, Zuo-Jun (Max); Lin, Wei-Hua; Zhang, Lin · Transportation Research Part C: Emerging Technologies · 2017