2014 IEEE 15th International Conference on Mobile Data Management (MDM): 14 [i.e. 15] - 18 July 2014, Brisbane, Australia ; ; [including papers from] International Workshop on Human Mobility Computing (HuMoComp) [and] International Workshop on Mobile Collaborative Crowdsourcing and Sensing (M-CROS)

9 Million Bicycles? (113-116). Stefan Jansen, Denis Höting, Jens Runge, Thomas Brinkhoff, Daniela Nicklas, Jürgen Sauer.