BibTeX

@ARTICLE{iumj11040,
    author = "Ebbe Poulsen",
     title = "On the Local Origin of the Essential Spectra of Elliptic Differential Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 11,
      year = 1962,
     issue = 5,
     pages = "725--747",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj11040}{article}{
     author = {Poulsen, Ebbe},
      title = {On the Local Origin of the Essential Spectra of Elliptic Differential Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {11},
       year = {1962},
     number = {5},
      pages = {725 \ndash 747},
}