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Springer-Verlag|year=1983 |isbn= 0-387-90788-2}}
*{{citation|last=Berger|first=Marcel|authorlink=Marcel Berger|title=Geometry revealed. A Jacob's ladder to modern higher geometry|translator= Lester Senechal|publisher= Springer|year=2010|isbn= 978-3-540-70996-1}}
*{{citation|last=Busemann|first=Herbert|authorlink=Herbert Busemann|title=The geometry of geodesics|publisher= Academic Press|year=1955}}
*{{citation|last=Caratheodory|first=C.|authorlink=Constantin Caratheodory|title=Theory of functions of a complex variable. Vol. 2.|translator=F. Steinhardt. |publisher=Chelsea Publishing Company|year= 1954}}
*{{citation|last=Davis|first= Michael W.|title=The geometry and topology of Coxeter groups|series=London Mathematical Society Monographs|volume=32|publisher= Princeton University Press|year=2008|isbn= 978-0-691-13138-2}}
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