BibTeX

@ARTICLE{iumj42056,
    author = "Benjamin Lorica",
     title = "Existence of Orbits in Simple Mechanical Systems",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 42,
      year = 1993,
     issue = 4,
     pages = "1219--1238",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj42056}{article}{
     author = {Lorica, Benjamin},
      title = {Existence of Orbits in Simple Mechanical Systems},
    journal = {Indiana Univ. Math. J.},
     volume = {42},
       year = {1993},
     number = {4},
      pages = {1219 \ndash 1238},
}