BibTeX

@ARTICLE{iumj18051,
    author = "George Fix",
     title = "Higher-Order Rayleigh-Ritz Approximations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 18,
      year = 1969,
     issue = 7,
     pages = "645--657",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj18051}{article}{
     author = {Fix, George},
      title = {Higher-Order Rayleigh-Ritz Approximations},
    journal = {Indiana Univ. Math. J.},
     volume = {18},
       year = {1969},
     number = {7},
      pages = {645 \ndash 657},
}