BibTeX

@ARTICLE{iumj25068,
    author = "Casper Goffman and Fon-Che Liu",
     title = "The Area Formula for Sobolev Mappings",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 25,
      year = 1976,
     issue = 9,
     pages = "871--876",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj25068}{article}{
     author = {Goffman, Casper},
     author = {Liu, Fon-Che},
      title = {The Area Formula for Sobolev Mappings},
    journal = {Indiana Univ. Math. J.},
     volume = {25},
       year = {1976},
     number = {9},
      pages = {871 \ndash 876},
}