DIRECT CONNECTION ON THE MOVE: CHARACTERIZATION OF USER MOBILITY IN CELLULAR-ASSISTED D2D SYSTEMS Article Orsino A., Moltchanov D., Gapeyenko M., Samuylov A., Andreev S., Militano L., Araniti G., Koucheryavy Y. IEEE Vehicular Technology Magazine. Vol. Vol 11 Issue 3. 2016. P. 38-48