@book{4400,
	author = {GSMA (Organization)‏},
	title = {Global mobile trends },
	publisher = {GSMA  Intelligence},
	year = {2016},
	url = {https://data.gsmaintelligence.com/api-web/v2/research-file-download?id=18809377&file=global-mobile-trends-1482139998965.pdf},
}