@article {nomikos2019flex,
	title = {Flex-NOMA: exploiting buffer-aided relay selection for massive connectivity in the 5G uplink},
	journal = {IEEE Access},
	volume = {7},
	year = {2019},
	pages = {88743{\textendash}88755},
	publisher = {IEEE},
	author = {Nomikos, Nikolaos and Emmanouel T. Michailidis and Trakadas, Panagiotis and Vouyioukas, Demosthenes and Zahariadis, Theodore and Ioannis Krikidis}
}
