BibTeX

@ARTICLE{iumj31053,
    author = "Jim Agler",
     title = "Geometric and Topological Properties of the Numerical Range",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 31,
      year = 1982,
     issue = 6,
     pages = "767--777",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj31053}{article}{
     author = {Agler, Jim},
      title = {Geometric and Topological Properties of the Numerical Range},
    journal = {Indiana Univ. Math. J.},
     volume = {31},
       year = {1982},
     number = {6},
      pages = {767 \ndash 777},
}