no. 4
Characteristic equations for the spectrum of generators
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 4, pp. 703-717. 
@article{ASNSP_1997_4_24_4_703_0,
     author = {Nagel, Rainer J.},
     title = {Characteristic equations for the spectrum of generators},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {703--717},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 24},
     number = {4},
     year = {1997},
     zbl = {0912.47023},
     mrnumber = {1627330},
     language = {en},
     url = {archive.numdam.org/item/ASNSP_1997_4_24_4_703_0/}
}
Nagel, Rainer. Characteristic equations for the spectrum of generators. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 24 (1997) no. 4, pp. 703-717. http://archive.numdam.org/item/ASNSP_1997_4_24_4_703_0/

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