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@Book{            book:976423,
  Author        = "van Dalen, Dirk",
  date-added    = "2020-04-10 11:07:26 +0200",
  date-modified = "2020-04-10 11:07:26 +0200",
  Edition       = "5th",
  ISBN          = "978-1-4471-4557-8,978-1-4471-4558-5",
  Publisher     = "Springer",
  Series        = "Universitext",
  Title         = "Logic and Structure",
  URL           = "http://gen.lib.rus.ec/book/index.php?md5=96fa5c52924e5dacbd190a6b18f0a69e",
  Year          = "2013",
  bdsk-url-1    = "http://gen.lib.rus.ec/book/index.php?md5=96fa5c52924e5dacbd190a6b18f0a69e",
  File          = "Logic and Structure by Dirk van Dalen (z-lib.org) - a - a - a.pdf"
}

@Book{ book:976423, Author = "van Dalen, Dirk", date-added = "2020-04-10 11:07:26 +0200", date-modified = "2020-04-10 11:07:26 +0200", Edition = "5th", ISBN = "978-1-4471-4557-8,978-1-4471-4558-5", Publisher = "Springer", Series = "Universitext", Title = "Logic and Structure", URL = "http://gen.lib.rus.ec/book/index.php?md5=96fa5c52924e5dacbd190a6b18f0a69e", Year = "2013", bdsk-url-1 = "http://gen.lib.rus.ec/book/index.php?md5=96fa5c52924e5dacbd190a6b18f0a69e", File = "Logic and Structure by Dirk van Dalen (z-lib.org) - a - a - a.pdf" }