BibTeX

@ARTICLE{iumj31026,
    author = "Steven Harris",
     title = "A Triangle Comparison Theorem for Lorentz Manifolds",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 31,
      year = 1982,
     issue = 3,
     pages = "289--308",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj31026}{article}{
     author = {Harris, Steven},
      title = {A Triangle Comparison Theorem for Lorentz Manifolds},
    journal = {Indiana Univ. Math. J.},
     volume = {31},
       year = {1982},
     number = {3},
      pages = {289 \ndash 308},
}