BibTeX

@ARTICLE{iumj20068,
    author = "R. Brooks",
     title = "Boundaries for Natural Systems",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 20,
      year = 1971,
     issue = 9,
     pages = "865--875",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj20068}{article}{
     author = {Brooks, R.},
      title = {Boundaries for Natural Systems},
    journal = {Indiana Univ. Math. J.},
     volume = {20},
       year = {1971},
     number = {9},
      pages = {865 \ndash 875},
}