BibTeX

@ARTICLE{iumj10038,
    author = "Minoru Urabe",
     title = "Potential Forces Which Yield Periodic Motions of a Fixed Period",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 10,
      year = 1961,
     issue = 4,
     pages = "569--578",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj10038}{article}{
     author = {Urabe, Minoru},
      title = {Potential Forces Which Yield Periodic Motions of a Fixed Period},
    journal = {Indiana Univ. Math. J.},
     volume = {10},
       year = {1961},
     number = {4},
      pages = {569 \ndash 578},
}