1. B. Behrens, Thermal protection and hot structures for re-usable launch systems, Third European Conference on Launcher Technology, Strasbourg, December 2001.
2. W.P.P. Fischer, B. Behrens, Development status of TPS candidates for future RLVs, Third International Symposium Atmospheric Reentry Vehicles and Systems, Arcachon, March 2003.
3. FSS-RIBRE-PRE-0002-02, ASTRA Zwischenbericht zu AP140, 21.11.2002.