✓

@Book{            book:453285,
  Author        = "Norwich, John Julius",
  date-added    = "2020-04-10 11:07:26 +0200",
  date-modified = "2020-04-10 11:07:26 +0200",
  ISBN          = "0679772693,9780679772699",
  Keywords      = "history",
  Publisher     = "Vintage",
  Title         = "A Short History of Byzantium",
  URL           = "http://gen.lib.rus.ec/book/index.php?md5=EF4976501A6B3E50114BCD00E768960E",
  Year          = "1998",
  bdsk-url-1    = "http://gen.lib.rus.ec/book/index.php?md5=EF4976501A6B3E50114BCD00E768960E",
  File          = "A Short History of Byzantium - Norwich (0) (0) - a - a.pdf"
}

@Book{ book:453285, Author = "Norwich, John Julius", date-added = "2020-04-10 11:07:26 +0200", date-modified = "2020-04-10 11:07:26 +0200", ISBN = "0679772693,9780679772699", Keywords = "history", Publisher = "Vintage", Title = "A Short History of Byzantium", URL = "http://gen.lib.rus.ec/book/index.php?md5=EF4976501A6B3E50114BCD00E768960E", Year = "1998", bdsk-url-1 = "http://gen.lib.rus.ec/book/index.php?md5=EF4976501A6B3E50114BCD00E768960E", File = "A Short History of Byzantium - Norwich (0) (0) - a - a.pdf" }