On convexity, the Weyl group and the Iwasawa decomposition
Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 6 (1973) no. 4, pp. 413-455. 
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     author = {Kostant, Bertram},
     title = {On convexity, the {Weyl} group and the {Iwasawa} decomposition},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
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     volume = {Ser. 4, 6},
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     doi = {10.24033/asens.1254},
     mrnumber = {51 #806},
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     url = {http://archive.numdam.org/articles/10.24033/asens.1254/}
}
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Kostant, Bertram. On convexity, the Weyl group and the Iwasawa decomposition. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 6 (1973) no. 4, pp. 413-455. doi : 10.24033/asens.1254. http://archive.numdam.org/articles/10.24033/asens.1254/

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