no. 1
On a problem of Freudenthal's
Compositio Mathematica, Tome 35 (1977) no. 1, pp. 39-47. 
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     author = {Abels, Herbert},
     title = {On a problem of {Freudenthal's}},
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     number = {1},
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     mrnumber = {466399},
     zbl = {0352.22003},
     language = {en},
     url = {http://www.numdam.org/item/CM_1977__35_1_39_0/}
}
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Abels, Herbert. On a problem of Freudenthal's. Compositio Mathematica, Tome 35 (1977) no. 1, pp. 39-47. http://www.numdam.org/item/CM_1977__35_1_39_0/

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