Smart Cities, Green Technologies, and Intelligent Transport Systems 4th International Conference, SMARTGREENS 2015, and 1st International Conference VEHITS 2015, Lisbon, Portugal, May 20-22, 2015, Revised Selected Papers - Helfert, Markus; Krempels, Karl-Heinz; Klein, Cornel; Donnellan, Brian; Gusikhin, Oleg (Springer International Publishing : Imprint: Springer, 2015)