@article{10_4153_CJM_2005_003_4,
     author = {Binding, Paul and Strauss, Vladimir},
     title = {On {Operators} with {Spectral} {Square} but without {Resolvent} {Points}},
     journal = {Canadian journal of mathematics},
     pages = {61--81},
     year = {2005},
     volume = {57},
     number = {1},
     doi = {10.4153/CJM-2005-003-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2005-003-4/}
}