BibTeX

@ARTICLE{iumj28016,
    author = "N. Levan",
     title = "On the Unitary Subspace of a Dissipative Perturbation of a Contraction Semigroup",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 28,
      year = 1979,
     issue = 2,
     pages = "241--249",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj28016}{article}{
     author = {Levan, N.},
      title = {On the Unitary Subspace of a Dissipative Perturbation of a Contraction Semigroup},
    journal = {Indiana Univ. Math. J.},
     volume = {28},
       year = {1979},
     number = {2},
      pages = {241 \ndash 249},
}