info:oai:authors.library.caltech.edu:11699info:ofi/fmt:xml:xsd:journalRehbeinHenningRehbein, HenningMüller-EbhardtHelgeMüller-Ebhardt, HelgeSomiyaKentaroSomiya, KentaroDanilishinStefan L.Danilishin, Stefan L.SchnabelRomanSchnabel, RomanDanzmannKarstenDanzmann, KarstenChenYanbeiChen, Yanbei67815 September 20081550-7998Double optical spring enhancement for gravitational-wave detectorsPhysical Review DArt. No. 062003article