@article{CRMATH_2007__344_1_11_0,
     author = {Marius M\u{a}ntoiu and Radu Purice and Serge Richard},
     title = {On the essential spectrum of magnetic pseudodifferential operators},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {11--14},
     publisher = {Elsevier},
     volume = {344},
     number = {1},
     year = {2007},
     doi = {10.1016/j.crma.2006.11.001},
     language = {en},
}