↑ Stefan Hild; Simon Chelkowski; Andreas Freise (2008-11-24), Pushing towards the ET sensitivity using 'conventional' technology, Bibcode:2008arXiv0810.0604H, arXiv:0810.0604 ↑ ET Design Study Participants 10 October 2008. 1 2 3 ET Science Team (June 28, 2011).