BibTeX

@ARTICLE{iumj28040,
    author = "Jose Barra­a",
     title = "The Commutative Product V_1^* V_2 = V_2 V_1^* for Isometries V_1 and V_2",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 28,
      year = 1979,
     issue = 4,
     pages = "581--586",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj28040}{article}{
     author = {Barra­a, Jose},
      title = {The Commutative Product V_1^* V_2 = V_2 V_1^* for Isometries V_1 and V_2},
    journal = {Indiana Univ. Math. J.},
     volume = {28},
       year = {1979},
     number = {4},
      pages = {581 \ndash 586},
}