凯莱-克莱因模型 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "凯莱-克莱因模型" in Chinese language version.

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Beltrami, Eugenio. Teoria fondamentale degli spazii di curvatura costante. Annali. di Mat., ser II. 1868, 2: 232–255. doi:10.1007/BF02419615.
Cayley, Arthur. A Sixth Memoire upon Quantics. Philosophical Transactions of the Royal Society of London. 1859, 159: 61–91. doi:10.1098/rstl.1859.0004.
Klein, Felix. Ueber die sogenannte Nicht-Euklidische Geometrie. Mathematische Annalen. 1871, 4: 573–625. doi:10.1007/BF02100583.