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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Duocylinder/fnuWpmf7">Duocylinder</a> - <a href="/facts/Cartesian_product/BfqBWzdL">Cartesian product</a> of two <a href="/facts/Disk_(mathematics)/DgMVr97H">disks</a></li> <li><a href="/facts/Proprism/EA1JVFhT">Proprism</a></li></ul> <ul><li>Hofmann, Karl H.; Morris, Sidney A. (2006), <a href="https://books.google.com/books?id=pOi60a0Th4kC"><i>The structure of compact groups</i></a>, de Gruyter Studies in Mathematics, vol. 25 (2nd ed.), Berlin: Walter de Gruyter & Co., <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-3-11-019006-9, <a href="/facts/MR_(identifier)/uP137L11">MR</a> <a href="https://mathscinet.ams.org/mathscinet-getitem?mr=2261490">2261490</a></li></ul>