BibTeX

@ARTICLE{iumj19065,
    author = "J. Freeman",
     title = "The Tensor Product of Semigroups and the Operator Equation SX - XT = A",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 19,
      year = 1970,
     issue = 9,
     pages = "819--828",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj19065}{article}{
     author = {Freeman, J.},
      title = {The Tensor Product of Semigroups and the Operator Equation SX - XT = A},
    journal = {Indiana Univ. Math. J.},
     volume = {19},
       year = {1970},
     number = {9},
      pages = {819 \ndash 828},
}