Rehbein, Henning and Müller-Ebhardt, Helge and Somiya, Kentaro and Danilishin, Stefan L. and Schnabel, Roman and Danzmann, Karsten and Chen, Yanbei (2008) Double optical spring enhancement for gravitational-wave detectors. Physical Review D, 78 (6). Art. No. 062003. ISSN 1550-7998 http://resolver.caltech.edu/CaltechAUTHORS:REHprd08