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https://arxiv.org/abs/astro-ph/0103158 [astro-ph/0103158] Exploring Topology of the Universe in the Cosmic Microwave Background Abstract page for arXiv paper astro-ph/0103158: Exploring Topology of the Universe in the Cosmic Microwave Background topology of the universe https://www.aanda.org/articles/aa/full_html/2014/11/aa21546-13/aa21546-13.html Planck 2013 results. XXVI. Background geometry and topology of the Universe | Astronomy &... topology of the universe 2013 results