BibTeX

@ARTICLE{iumj14017,
    author = "J. Ahlberg and E. Nilson and J. Walsh",
     title = "Best Approximation and Convergence Properties of Higher-Order Spline Approximations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 14,
      year = 1965,
     issue = 2,
     pages = "231--243",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj14017}{article}{
     author = {Ahlberg, J.},
     author = {Nilson, E.},
     author = {Walsh, J.},
      title = {Best Approximation and Convergence Properties of Higher-Order Spline Approximations},
    journal = {Indiana Univ. Math. J.},
     volume = {14},
       year = {1965},
     number = {2},
      pages = {231 \ndash 243},
}