BibTeX

@ARTICLE{iumj22008,
    author = "D. Clark",
     title = "A Variant of the Lusternik-Schnirelman Theory",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 22,
      year = 1973,
     issue = 1,
     pages = "65--74",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj22008}{article}{
     author = {Clark, D.},
      title = {A Variant of the Lusternik-Schnirelman Theory},
    journal = {Indiana Univ. Math. J.},
     volume = {22},
       year = {1973},
     number = {1},
      pages = {65 \ndash 74},
}