Hyperbolic angle (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hyperbolic angle" in English language version.

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Augustus De Morgan (1849) Trigonometry and Double Algebra, Chapter VI: "On the connection of common and hyperbolic trigonometry"

Bjørn Felsager, Through the Looking Glass – A glimpse of Euclid's twin geometry, the Minkowski geometry Archived 2011-07-16 at the Wayback Machine, ICME-10 Copenhagen 2004; p.14. See also example sheets [1] Archived 2009-01-06 at the Wayback Machine [2] Archived 2008-11-21 at the Wayback Machine exploring Minkowskian parallels of some standard Euclidean results

Bjørn Felsager, Through the Looking Glass – A glimpse of Euclid's twin geometry, the Minkowski geometry Archived 2011-07-16 at the Wayback Machine, ICME-10 Copenhagen 2004; p.14. See also example sheets [1] Archived 2009-01-06 at the Wayback Machine [2] Archived 2008-11-21 at the Wayback Machine exploring Minkowskian parallels of some standard Euclidean results