| 6- Michael Rowan-Robinson, Cosmology, Oxford University Press, 1996 | 7- The Age of the Universe, Dark Matter, and Structure Formation, Colloquium on the Age of the Universe St, National Academies Press, 1998 |
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| org , 18 May 2001 | 5- Robert Sanders, "Dark matter" forms dense clumps in ghost universe, University of California, 05 November 2003 |
3- Maggie McKee, Washington DC, Mini-galaxies may reveal dark matter stream, New Scientist, 12 January 2006.
18| 3- Maggie McKee, Washington DC , Mini-galaxies may reveal dark matter stream, New Scientist, 12 January 2006 | 5- Robert Sanders, "Dark matter" forms dense clumps in ghost universe, University of California , 05 November 2003 |
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| 6- Michael Rowan-Robinson, Cosmology, Oxford University Press, 1996 |