BibTeX

@ARTICLE{iumj31021,
    author = "Marc Raphael",
     title = "Quasisimilarity and Essential Spectra for Subnormal Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 31,
      year = 1982,
     issue = 2,
     pages = "243--246",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj31021}{article}{
     author = {Raphael, Marc},
      title = {Quasisimilarity and Essential Spectra for Subnormal Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {31},
       year = {1982},
     number = {2},
      pages = {243 \ndash 246},
}