@book{5504,
	author = {GSMA (Organization)‏},
	title = {The Mobile Economy 2019},
	publisher = {GSM Association,},
	year = {2019},
	address = {London :},
	url = {https://www.gsmaintelligence.com/research/?file=b9a6e6202ee1d5f787cfebb95d3639c5&download},
}