- ... 2006
- Based on observations performed at the National Astronomical Observatory, Rozhen, Bulgaria.
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- ... Telescope
- http://hubblesite.org/newscenter/archive/releases/2006/18/fastfacts/
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- ... ESO-VLT
- http://www.eso.org/public/outreach/press-rel/pr-2006/phot-15-06.html
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