@Manual{          Haskel98,
  Author        = "Hudak, Paul and Peterson, John and Fasel, Joseph H.",
  date-added    = "2018-11-23 19:24:22 +0100",
  date-modified = "2018-11-23 19:25:18 +0100",
  Title         = "A Gentle Introduction to Haskell 98",
  File          = "Hudak\_P.-A\_gentle\_introduction\_to\_Haskell(1999) (0) - a - a - e.pdf"
}

@Manual{ Haskel98, Author = "Hudak, Paul and Peterson, John and Fasel, Joseph H.", date-added = "2018-11-23 19:24:22 +0100", date-modified = "2018-11-23 19:25:18 +0100", Title = "A Gentle Introduction to Haskell 98", File = "Hudak_P.-A_gentle_introduction_to_Haskell(1999) (0) - a - a - e.pdf" }