BibTeX

@ARTICLE{iumj13060,
    author = "B. Kripke and R. Rockafellar",
     title = "A Necessary Condition for the Existence of Best Approximations",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 13,
      year = 1964,
     issue = 6,
     pages = "1037--1038",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj13060}{article}{
     author = {Kripke, B.},
     author = {Rockafellar, R.},
      title = {A Necessary Condition for the Existence of Best Approximations},
    journal = {Indiana Univ. Math. J.},
     volume = {13},
       year = {1964},
     number = {6},
      pages = {1037 \ndash 1038},
}