1. Hall, R.E., Bowerman, B., Braverman, J., Taylor, J., Todosow, H., Von Wimmersperg, U.: The vision of a smart city (No. BNL–67902; 04042). Brookhaven National Lab., Upton, NY, US (2000)
2. Research Institute for Housing, Urban and Mobility Studies (OTB): Smart cities ranking of European medium-sized cities. http://smartcity-ranking.org/download/smart_cities_final_report.pdf . Accessed 25 May 2017
3. Lewis, J.: The top 10 smart city applications of 2016. http://www.telensa.com/2016/04/07/top-10-smart-city-applications-2016/ . Accessed 25 May 2017
4. Urban Population Growth. http://www.who.int/gho/urban_health/situation_trends/urban_population_growth_text/en/ . Accessed 25 May 2017
5. Hoornweg, D., Bhada-Tata, P.: What a waste: a global review of solid waste management. In: Urban Development Series Knowledge Papers, pp. 1–98. World Bank, Washington, DC, USA (2015)