BibTeX

@ARTICLE{iumj25014,
    author = "William Derrick and H. Kuiper",
     title = "Nonlinear Ordinary and Functional Sturm-Liouville Problems",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 25,
      year = 1976,
     issue = 2,
     pages = "179--190",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj25014}{article}{
     author = {Derrick, William},
     author = {Kuiper, H.},
      title = {Nonlinear Ordinary and Functional Sturm-Liouville Problems},
    journal = {Indiana Univ. Math. J.},
     volume = {25},
       year = {1976},
     number = {2},
      pages = {179 \ndash 190},
}