Enhanced Resource Allocation in D2D Communications With NOMA and Unlicensed Spectrum Le, Mai ; Pham, Quoc-Viet ; Kim, Hee-Cheol ; Hwang, Won-Joo Abstract Publication: IEEE Systems Journal Pub Date: June 2022 DOI: 10.1109/JSYST.2021.3136208 Bibcode: 2022ISysJ..16.2856L