Liu, K.-H.K.-H.LiuPHONE LIN2020-05-042020-05-042015https://scholars.lib.ntu.edu.tw/handle/123456789/489413Toward self-sustainable cooperative relays: State of the art and the futurejournal article10.1109/MCOM.2015.7120018https://www.scopus.com/inward/record.uri?eid=2-s2.0-84933515623&doi=10.1109%2fMCOM.2015.7120018&partnerID=40&md5=a189b5612ec40744e6412e2bced69da8