BibTeX

@ARTICLE{iumj21017,
    author = "Neil Fenichel",
     title = "Persistence and Smoothness of Invariant Manifolds for Flows",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 21,
      year = 1972,
     issue = 3,
     pages = "193--226",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj21017}{article}{
     author = {Fenichel, Neil},
      title = {Persistence and Smoothness of Invariant Manifolds for Flows},
    journal = {Indiana Univ. Math. J.},
     volume = {21},
       year = {1972},
     number = {3},
      pages = {193 \ndash 226},
}