BibTeX

@ARTICLE{iumj52024,
    author = "Eberhard Hopf",
     title = "On an Inequality for Minimal Surfaces z = z(x, y)",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 2,
      year = 1953,
     issue = 3,
     pages = "519--522",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj52024}{article}{
     author = {Hopf, Eberhard},
      title = {On an Inequality for Minimal Surfaces z = z(x, y)},
    journal = {Indiana Univ. Math. J.},
     volume = {2},
       year = {1953},
     number = {3},
      pages = {519 \ndash 522},
}