BibTeX

@ARTICLE{iumj13038,
    author = "George Biriuk and Earl Coddington",
     title = "Normal Extensions of Unbounded Formally Normal Operators",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 13,
      year = 1964,
     issue = 4,
     pages = "617--637",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj13038}{article}{
     author = {Biriuk, George},
     author = {Coddington, Earl},
      title = {Normal Extensions of Unbounded Formally Normal Operators},
    journal = {Indiana Univ. Math. J.},
     volume = {13},
       year = {1964},
     number = {4},
      pages = {617 \ndash 637},
}