1. Life-Cycle Cost Comparison of Reusable Launch Systems;Berry;IAF Paper 95-IAA.1.1.02,1995
2. Sänger Concept Study, Phase Ib from May 1, 1991 – Jan. 31, 1993;DASA, OHB,1993
3. FSS-12 Conceptual Launcher Design — Evaluation and Synthesis;DASA;Final Report, Doc. No. FSS-SCT-RP-0007/2,1996
4. TSTO-R-VTHL Concept FSS-9;DASA;System Concept Report FESTIP 1,1997