@article{ASENS_1973_4_6_4_413_0,
     author = {Kostant, Bertram},
     title = {On convexity, the {Weyl} group and the {Iwasawa} decomposition},
     journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure},
     pages = {413--455},
     publisher = {Elsevier},
     volume = {Ser. 4, 6},
     number = {4},
     year = {1973},
     doi = {10.24033/asens.1254},
     mrnumber = {51 #806},
     zbl = {0293.22019},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/asens.1254/}
}