@article{BUMI_2008_9_1_1_a2,
     author = {Venni, Alberto},
     title = {A {Note} on {Sectorial} and {R-Sectorial} {Operators}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {79--85},
     publisher = {mathdoc},
     volume = {Ser. 9, 1},
     number = {1},
     year = {2008},
     zbl = {1164.47041},
     mrnumber = {2387998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2008_9_1_1_a2/}
}