Zhang, U.-H.U.-H.ZhangTZI-HONG CHIUEH2019-12-272019-12-272017https://scholars.lib.ntu.edu.tw/handle/123456789/442057Cosmological perturbations of extreme axion in the radiation erajournal article10.1103/PhysRevD.96.0635222-s2.0-85031728821https://www.scopus.com/inward/record.uri?eid=2-s2.0-85031728821&doi=10.1103%2fPhysRevD.96.063522&partnerID=40&md5=81a6ef16772665ce370b7b43e9600e4a