BibTeX

@ARTICLE{iumj43034,
    author = "Morris Kalka and DaGang Yang",
     title = "On Nonpositive Curvature Functions on Noncompact Surfaces of Finite Topological Type",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 43,
      year = 1994,
     issue = 3,
     pages = "775--804",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj43034}{article}{
     author = {Kalka, Morris},
     author = {Yang, DaGang},
      title = {On Nonpositive Curvature Functions on Noncompact Surfaces of Finite Topological Type},
    journal = {Indiana Univ. Math. J.},
     volume = {43},
       year = {1994},
     number = {3},
      pages = {775 \ndash 804},
}