@InBook{          Johnson:1991,
  Author        = "Johnson, David S.",
  Address       = "Cambridge, MA, USA",
  BookTitle     = "Handbook of Theoretical Computer Science (Vol. A): Algorithms and Complexity",
  date-added    = "2021-12-30 15:06:07 +0100",
  date-modified = "2021-12-30 15:07:10 +0100",
  ISBN          = "0444880712",
  numpages      = "95",
  Pages         = "67---161",
  Publisher     = "MIT Press",
  Title         = "A Catalog of Complexity Classes",
  Year          = "1991",
  File          = "johnson1990.pdf"
}

@InBook{ Johnson:1991, Author = "Johnson, David S.", Address = "Cambridge, MA, USA", BookTitle = "Handbook of Theoretical Computer Science (Vol. A): Algorithms and Complexity", date-added = "2021-12-30 15:06:07 +0100", date-modified = "2021-12-30 15:07:10 +0100", ISBN = "0444880712", numpages = "95", Pages = "67---161", Publisher = "MIT Press", Title = "A Catalog of Complexity Classes", Year = "1991", File = "johnson1990.pdf" }