A geometric classification of positively curved symmetric spaces and the isoparametric construction of the Cayley plane
On the Geometry of Differentiable Manifolds Rome, 23-27 juin 1986, Astérisque, no. 163-164 (1988), pp. 111-135 
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     author = {Karcher, Hermann},
     title = {A geometric classification of positively curved symmetric spaces and the isoparametric construction of the {Cayley} plane},
     booktitle = {On the Geometry of Differentiable Manifolds Rome, 23-27 juin 1986},
     series = {Ast\'erisque},
     pages = {111--135},
     year = {1988},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {163-164},
     zbl = {0669.53038},
     language = {en},
     url = {https://www.numdam.org/item/AST_1988__163-164__111_0/}
}
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Karcher, Hermann. A geometric classification of positively curved symmetric spaces and the isoparametric construction of the Cayley plane, dans On the Geometry of Differentiable Manifolds Rome, 23-27 juin 1986, Astérisque, no. 163-164 (1988), pp. 111-135. https://www.numdam.org/item/AST_1988__163-164__111_0/

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