TY - CHAP A1 - Kling, Günther A1 - Lucarelli, Stefano A1 - Hartmann, Peter A1 - Nattermann, Kurt A1 - Döhring, Thorsten A1 - Kuhr, Markus A1 - Thomas, Peter T1 - Double Ring Tests on ZERODUR K20 and Etched ZERODUR T2 - Proceedings 11th European Conference on Spacecraft Structures, Materials and Mechanical Testing, 15-17 Sep 2009, Toulouse, France KW - Spiegelteleskop KW - Zerodur KW - Glaskeramik Y1 - 2009 ER -