BibTeX

@ARTICLE{iumj30016,
    author = "David Barnes",
     title = "Lower Bounds for Eigenvalues of Sturm Liouville Systems",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 30,
      year = 1981,
     issue = 2,
     pages = "193--198",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj30016}{article}{
     author = {Barnes, David},
      title = {Lower Bounds for Eigenvalues of Sturm Liouville Systems},
    journal = {Indiana Univ. Math. J.},
     volume = {30},
       year = {1981},
     number = {2},
      pages = {193 \ndash 198},
}