BibTeX

@ARTICLE{iumj12016,
    author = "Alexander Weinstein",
     title = "The Intermediate Problems and the Maximum-Minimum Theory of Eigenvalues",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 12,
      year = 1963,
     issue = 2,
     pages = "235--245",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj12016}{article}{
     author = {Weinstein, Alexander},
      title = {The Intermediate Problems and the Maximum-Minimum Theory of Eigenvalues},
    journal = {Indiana Univ. Math. J.},
     volume = {12},
       year = {1963},
     number = {2},
      pages = {235 \ndash 245},
}