1. NASA SOF-1011, “Telescope Assembly (TA) Requirements,” NASA ARC, Rev. 1 Sept. 1988, Rev. 8 Nov., (2008)
2. SOFIA Pointing History,;Kärcher,2014
3. NASA’s Kuiper Airborne Observatory, 1971-1995: An Operations Retrospective with a View to SOFIA,;Erickson,2013
4. Ruhr Universität Bochum, “Hexapod Telescope HPT,” http://adsabs.harvard.edu/full/2000RvMA...13..257C, (2000)
5. HIPO: a high-speed imaging photometer for occultations,;Dunham,2004