@book{4806,
	author = {United for Smart Sustainable Cities},
	title = {Collection Methodology for Key Performance Indicators for Smart Sustainable Cities},
	publisher = {ITU},
	year = {2017},
	address = {Geneva},
	url = {https://www.itu.int/en/publications/Documents/tsb/2017-U4SSC-Collection-Methodology/mobile/index.html#p=1},
}