BibTeX

@ARTICLE{iumj2209,
    author = "Mark Tomforde",
     title = "Simplicity of ultragraph algebras",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 52,
      year = 2003,
     issue = 4,
     pages = "901--926",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "46L55;",
}

amsrefs

\bib{iumj2209}{article}{
     author = {Tomforde, Mark},
      title = {Simplicity of ultragraph algebras},
    journal = {Indiana Univ. Math. J.},
     volume = {52},
       year = {2003},
     number = {4},
      pages = {901 \ndash 926},
}