WEI-SHU HOUPAO-TI CHANGKAI-FENG CHEN2019-12-272019-12-272008https://scholars.lib.ntu.edu.tw/handle/123456789/442290journal article10.1103/PhysRevD.78.0111062-s2.0-48349146043https://www.scopus.com/inward/record.uri?eid=2-s2.0-48349146043&doi=10.1103%2fPhysRevD.78.011106&partnerID=40&md5=be00f04b8cffe0fdfb3cd198989fd93b