@Article{         Sheffer:AMS:1913,
  Author        = "Sheffer, Henry Maurice",
  date-added    = "2020-11-16 17:21:15 +0100",
  date-modified = "2020-11-16 17:21:36 +0100",
  ISSN          = "00029947",
  Journal       = "Transactions of the American Mathematical Society",
  Number        = "4",
  Pages         = "481--488",
  Publisher     = "American Mathematical Society",
  Title         = "A Set of Five Independent Postulates for Boolean Algebras, with Application to Logical Constants",
  URL           = "http://www.jstor.org/stable/1988701",
  Volume        = "14",
  Year          = "1913",
  bdsk-url-1    = "http://www.jstor.org/stable/1988701",
  File          = "A Set of Five Independent Postulates for Boolean Algebras, with Application to Logical Constants - 1988701 - a - n.pdf"
}

@Article{ Sheffer:AMS:1913, Author = "Sheffer, Henry Maurice", date-added = "2020-11-16 17:21:15 +0100", date-modified = "2020-11-16 17:21:36 +0100", ISSN = "00029947", Journal = "Transactions of the American Mathematical Society", Number = "4", Pages = "481--488", Publisher = "American Mathematical Society", Title = "A Set of Five Independent Postulates for Boolean Algebras, with Application to Logical Constants", URL = "http://www.jstor.org/stable/1988701", Volume = "14", Year = "1913", bdsk-url-1 = "http://www.jstor.org/stable/1988701", File = "A Set of Five Independent Postulates for Boolean Algebras, with Application to Logical Constants - 1988701 - a - n.pdf" }