@article{10_4064_sm171_3_1,
     author = {Khalid Latrach and J. Martin Paoli and Pierre Simonnet},
     title = {Some facts from descriptive set theory concerning essential spectra
and applications},
     journal = {Studia Mathematica},
     pages = {207--225},
     year = {2005},
     volume = {171},
     number = {3},
     doi = {10.4064/sm171-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm171-3-1/}
}