no. 2

Geometry of biinvariant subsets of complex semisimple Lie groups
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 2, pp. 329-356. 
@article{ASNSP_1998_4_26_2_329_0,
     author = {Fels, Gregor and Geatti, Laura},
     title = {Geometry of biinvariant subsets of complex semisimple Lie groups},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {329--356},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 26},
     number = {2},
     year = {1998},
     zbl = {0922.32011},
     mrnumber = {1631593},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1998_4_26_2_329_0/}
}
Fels, Gregor; Geatti, Laura. Geometry of biinvariant subsets of complex semisimple Lie groups. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 2, pp. 329-356. http://www.numdam.org/item/ASNSP_1998_4_26_2_329_0/

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