BibTeX

@ARTICLE{iumj23034,
    author = "Richard Bouldin",
     title = "Operators with a Unique Positive Near-Approximant",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 23,
      year = 1974,
     issue = 5,
     pages = "421--427",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj23034}{article}{
     author = {Bouldin, Richard},
      title = {Operators with a Unique Positive Near-Approximant},
    journal = {Indiana Univ. Math. J.},
     volume = {23},
       year = {1974},
     number = {5},
      pages = {421 \ndash 427},
}