| Adams, Fred; Laughlin, Greg July 13, 2006 | Astronomy and Astrophysics 373 1 : 139—152 |
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| "Memorandum of Understanding Between The European Space Agency and The United States National Aeronautics and Space Administration", reprinted in NASA SP-2001-4407: Exploring the Unknown, Chapter 3, Document III-29, p | "A spiral nebula as a stellar system, Messier 31" |
University of Maryland Department of Astronomy.
2| The technician who performed the test noted an unexpected gap between the field lens and its supporting structure in the corrector and filled it in with an ordinary metal washer | "Telescope Is Set to Peer at Space and Time" |
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| "The radial velocity of the Andromeda Nebula" | Also includes other NASA astronomy programs |
Bulletin of the American Astronomical Society 26: 911.
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