1. Townsend, A.M.: ‘Mobile Communications in the 21st Century City’, Brown, B., Green, N., Harper, R., The wireless world: social and interactional aspects of the mobile age, (Springer-Verlag, Berlin 2001)
2. ACCURACY OF SPEED MEASUREMENTS FROM CELLULAR PHONE VEHICLE LOCATION SYSTEMS
3. Sohn, K.: ‘Dynamic estimation of origin–destination flows using cell phones as probes’, (SDI 2004-R-04, Department of Urban Transportation, Seoul Development Institute, Korea 2004)