BibTeX

@ARTICLE{iumj20062,
    author = "A. Shields and L. Wallen",
     title = "The Commutants of Certain Hilbert Space Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 20,
      year = 1971,
     issue = 9,
     pages = "777--788",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj20062}{article}{
     author = {Shields, A.},
     author = {Wallen, L.},
      title = {The Commutants of Certain Hilbert Space Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {20},
       year = {1971},
     number = {9},
      pages = {777 \ndash 788},
}