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 / Markus Helfert, Karl-Heinz Krempels, Cornel Klein, Brian Donnellan, Oleg Gusikhin (eds.)
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