no. 2
A characterization of spectral operators of finite type
Compositio Mathematica, Tome 26 (1973) no. 2, pp. 95-99 
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     author = {Cleaver, Charles E.},
     title = {A characterization of spectral operators of finite type},
     journal = {Compositio Mathematica},
     pages = {95--99},
     year = {1973},
     publisher = {Noordhoff International Publishing},
     volume = {26},
     number = {2},
     mrnumber = {320802},
     zbl = {0255.47042},
     language = {en},
     url = {https://www.numdam.org/item/CM_1973__26_2_95_0/}
}
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Cleaver, Charles E. A characterization of spectral operators of finite type. Compositio Mathematica, Tome 26 (1973) no. 2, pp. 95-99. https://www.numdam.org/item/CM_1973__26_2_95_0/

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