@article{10_4153_CMB_2012_016_1,
     author = {Mustafayev, H. S.},
     title = {The {Essential} {Spectrum} of the {Essentially} {Isometric} {Operator}},
     journal = {Canadian mathematical bulletin},
     pages = {145--158},
     year = {2014},
     volume = {57},
     number = {1},
     doi = {10.4153/CMB-2012-016-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2012-016-1/}
}