@article{10_4153_CJM_1977_045_x,
     author = {Bezak, Nicholas J. and Eisen, Martin},
     title = {Continuity {Properties} of {Operator} {Spectra}},
     journal = {Canadian journal of mathematics},
     pages = {429--437},
     year = {1977},
     volume = {29},
     number = {2},
     doi = {10.4153/CJM-1977-045-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1977-045-x/}
}