no. 2
Semistable quotients
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 2, pp. 233-248. 
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     title = {Semistable quotients},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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     zbl = {0922.32017},
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Heinzner, Peter; Migliorini, Luca; Polito, Marzia. Semistable quotients. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 26 (1998) no. 2, pp. 233-248. http://archive.numdam.org/item/ASNSP_1998_4_26_2_233_0/

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