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== Pranala luar ==
* [http://icosmos.co.uk Geometry of the Universe]
* [http://physicsworld.com/cws/article/print/23009 A cosmic hall of mirrors] {{Webarchive|url=https://web.archive.org/web/20120225002759/http://physicsworld.com/cws/article/print/23009 |date=2012-02-25 }} – physicsworld (26 September 2005)
* [http://news.nationalgeographic.com/news/2003/10/1008_031008_finiteuniverse.html Universe is Finite, "Soccer Ball"-Shaped, Study Hints.] Possible wrap-around dodecahedral shape of the universe
* {{cite journal|author1=Ralf Aurich|author2=Sven Lustig|author3=Frank Steiner|author4=Holger Then|doi=10.1088/0264-9381/21/21/010|journal=[[Classical and Quantum Gravity]]|volume=21|title=Hyperbolic Universes with a Horned Topology and the CMB Anisotropy|issue=21|pages=4901–4925|year=2004|arxiv=astro-ph/0403597|bibcode=2004CQGra..21.4901A}}