BibTeX

@ARTICLE{iumj20050,
    author = "Melvyn Berger and L. Fraenkel",
     title = "On Singular Perturbations of Nonlinear Operator Equations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 20,
      year = 1971,
     issue = 7,
     pages = "623--631",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj20050}{article}{
     author = {Berger, Melvyn},
     author = {Fraenkel, L.},
      title = {On Singular Perturbations of Nonlinear Operator Equations},
    journal = {Indiana Univ. Math. J.},
     volume = {20},
       year = {1971},
     number = {7},
      pages = {623 \ndash 631},
}