BibTeX

@ARTICLE{iumj19010,
    author = "William Gordon",
     title = "On the Relation between Period and Energy in Periodic Dynamical Systems",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 19,
      year = 1970,
     issue = 2,
     pages = "111--114",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj19010}{article}{
     author = {Gordon, William},
      title = {On the Relation between Period and Energy in Periodic Dynamical Systems},
    journal = {Indiana Univ. Math. J.},
     volume = {19},
       year = {1970},
     number = {2},
      pages = {111 \ndash 114},
}