@article{10_1017_S2040618500034754,
     author = {Bonsall, F. F.},
     title = {A polynomial iteration for the spectral family of an operator},
     journal = {Glasgow mathematical journal},
     pages = {65--69},
     year = {1963},
     volume = {6},
     number = {2},
     doi = {10.1017/S2040618500034754},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S2040618500034754/}
}