BibTeX

@ARTICLE{iumj30042,
    author = "Richard Bouldin",
     title = "The Essential Minimum Modulus",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 30,
      year = 1981,
     issue = 4,
     pages = "513--517",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj30042}{article}{
     author = {Bouldin, Richard},
      title = {The Essential Minimum Modulus},
    journal = {Indiana Univ. Math. J.},
     volume = {30},
       year = {1981},
     number = {4},
      pages = {513 \ndash 517},
}