Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) S. M. Riazul Islam and Nurilla Avazov and Octavia A. Dobre and Kyung-sup Kwak,Power-Domain Non-Orthogonal Multiple Access (NOMA) in 5G Systems: Potentials and Challenges,IEEE Communications Surveys & Tutorials,1553-877X,Institute of Electrical and Electronics Engineers (IEEE),2017,19,2,721-742,https://cir.nii.ac.jp/crid/1363670318829731584,https://doi.org/10.1109/comst.2016.2621116