Tohutoro APA (7th ed.)
Fenchel, W. (1989). Elementary geometry in hyperbolic space. Walter de Gruyter.
Tohutoru Kātū Chicago (17th ed.)
Fenchel, W. Elementary Geometry in Hyperbolic Space. Berlin ; New York: Walter de Gruyter, 1989.
Tohutoro MLA (9th ed.)
Fenchel, W. Elementary Geometry in Hyperbolic Space. Walter de Gruyter, 1989.
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