The group of motions of a two dimensional elliptic geometry
Compositio Mathematica, Tome 9 (1951), pp. 241-288 
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     author = {Baer, Reinhold},
     title = {The group of motions of a two dimensional elliptic geometry},
     journal = {Compositio Mathematica},
     pages = {241--288},
     year = {1951},
     publisher = {Kraus Reprint},
     volume = {9},
     mrnumber = {48051},
     zbl = {0045.10001},
     language = {en},
     url = {https://www.numdam.org/item/CM_1951__9__241_0/}
}
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Baer, Reinhold. The group of motions of a two dimensional elliptic geometry. Compositio Mathematica, Tome 9 (1951), pp. 241-288. https://www.numdam.org/item/CM_1951__9__241_0/

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