BibTeX

@ARTICLE{iumj59036,
    author = "I. Segal",
     title = "A Note on the Concept of Entropy",
   journal = "Indiana Univ. Math. J.",
  fjournal = "Indiana University Mathematics Journal",
    volume = 9,
      year = 1960,
     issue = 4,
     pages = "623--629",
      issn = "0022-2518",
     coden = "IUMJAB",
   mrclass = "",
}

amsrefs

\bib{iumj59036}{article}{
     author = {Segal, I.},
      title = {A Note on the Concept of Entropy},
    journal = {Indiana Univ. Math. J.},
     volume = {9},
       year = {1960},
     number = {4},
      pages = {623 \ndash 629},
}