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editDoes this topic really merit its own article? The phrase does not hit on Zentralblatt or Google Books. Has anyone since Klein written about the subject and if so, what did they say? Deltahedron (talk) 08:03, 10 November 2012 (UTC)
- The book Geometry of Riemann Surfaces and Teichmüller Spaces by Seppälä and Sorvali does mention it. MuDavid (talk) 07:54, 23 November 2018 (UTC)