@article {gkonis2020non,
	title = {Non-orthogonal multiple access in multiuser MIMO configurations via code reuse and principal component analysis},
	journal = {Electronics},
	volume = {9},
	number = {8},
	year = {2020},
	pages = {1330},
	publisher = {MDPI},
	author = {Gkonis, Panagiotis K. and Trakadas, Panagiotis T and Sarakis, Lambros E}
}
