BibTeX

@ARTICLE{iumj26014,
    author = "Richard Warren",
     title = "Boundary of a Fuzzy Set",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 26,
      year = 1977,
     issue = 2,
     pages = "191--197",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj26014}{article}{
     author = {Warren, Richard},
      title = {Boundary of a Fuzzy Set},
    journal = {Indiana Univ. Math. J.},
     volume = {26},
       year = {1977},
     number = {2},
      pages = {191 \ndash 197},
}