"Dark matter in spiral galaxies" | The Night Sky Observer's Guide, Volume 1 |
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Bulletin of the American Astronomical Society 26: 911 | University of Birmingham Astrophysics and Space Research Group |
Astrophysical Journal 514 1 : 77—95 | University of Maryland Department of Astronomy |
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"The on-orbit performance of WFPC2" | "Physical processes behind the morphological Hubble sequence" |