BibTeX

@ARTICLE{iumj16064,
    author = "Garrett Birkhoff",
     title = "Local Spline Approximation by Moments",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 16,
      year = 1967,
     issue = 9,
     pages = "987--990",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj16064}{article}{
     author = {Birkhoff, Garrett},
      title = {Local Spline Approximation by Moments},
    journal = {Indiana Univ. Math. J.},
     volume = {16},
       year = {1967},
     number = {9},
      pages = {987 \ndash 990},
}