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2. ESA-FESTIP (Future European Space Transportation Investigation Program), System Study, DASA—Daimler-Chrysler Aerospace, Final Report, December 1998.
3. D.E. Koelle, Development costs of reusable launch vehicles, Paper IAA-01-IAA.1.1.02, 52nd IAC, Toulouse, France, October 2001.
4. Specific transportation costs to GEO—past, present and future, IAC 2002;Koelle;Acta Astronautica,2003