BibTeX

@ARTICLE{iumj24049,
    author = "Sheldon Sickler",
     title = "The Invariant Subspaces of Almost Unitary Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 24,
      year = 1975,
     issue = 7,
     pages = "635--650",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj24049}{article}{
     author = {Sickler, Sheldon},
      title = {The Invariant Subspaces of Almost Unitary Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {24},
       year = {1975},
     number = {7},
      pages = {635 \ndash 650},
}