Liu, Y.-W.Y.-W.LiuPISIN CHEN2019-12-262019-12-262015https://scholars.lib.ntu.edu.tw/handle/123456789/440941Ghosts in the self-accelerating DGP branch with Gauss–Bonnet effectjournal article10.1140/epjc/s10052-015-3463-02-s2.0-84938276212https://www.scopus.com/inward/record.uri?eid=2-s2.0-84938276212&doi=10.1140%2fepjc%2fs10052-015-3463-0&partnerID=40&md5=9dc68b7f168d2bb74c72a9a6799d02a0