no. 2
The arithmetic-geometric mean and its generalizations for noncommuting linear operators
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 15 (1988) no. 2, pp. 239-308. 
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     title = {The arithmetic-geometric mean and its generalizations for noncommuting linear operators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
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Nussbaum, Roger D.; Cohen, Joel E. The arithmetic-geometric mean and its generalizations for noncommuting linear operators. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 15 (1988) no. 2, pp. 239-308. http://www.numdam.org/item/ASNSP_1988_4_15_2_239_0/

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