BibTeX

@ARTICLE{iumj12061,
    author = "L. Helms",
     title = "The Perron-Wiener Method for Diffusion Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 12,
      year = 1963,
     issue = 6,
     pages = "881--888",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj12061}{article}{
     author = {Helms, L.},
      title = {The Perron-Wiener Method for Diffusion Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {12},
       year = {1963},
     number = {6},
      pages = {881 \ndash 888},
}