@Unpublished{     Hyde,
  Author        = "Hyde, Trevor",
  date-added    = "2023-03-11 22:58:54 +0100",
  date-modified = "2023-03-11 22:59:14 +0100",
  Title         = "Combinatorial species and generating functions",
  File          = "Hyde -- Combinatorial species and generating functions - a.pdf",
  file-2        = "Combinatorial Species and Generating Functions Trevor Hyde - 020917 - a.pdf"
}

@Unpublished{ Hyde, Author = "Hyde, Trevor", date-added = "2023-03-11 22:58:54 +0100", date-modified = "2023-03-11 22:59:14 +0100", Title = "Combinatorial species and generating functions", File = "Hyde -- Combinatorial species and generating functions - a.pdf", file-2 = "Combinatorial Species and Generating Functions Trevor Hyde - 020917 - a.pdf" }