Smart cities, green technologies, and intelligent transport systems 6th International Conference, SMARTGREENS 2017, and Third International Conference, VEHITS 2017, Porto, Portugal, April 22-24, 2017 : revised selected papers - Donnellan, Brian; Klein, Cornel; Helfert, Markus 1970-; Gusikhin, Oleg; Pascoal, António (Springer, 2019)