@TechReport{      singer,
  Author        = "Singer, Michael F.",
  date-added    = "2022-12-20 11:43:36 +0100",
  date-modified = "2022-12-20 11:44:03 +0100",
  Title         = "Algebraic Solutions of nth Order Linear Differential Equations",
  File          = "Algebraic Solutions of nth Order Linear Differential Equations - algsolns.pdf"
}

@TechReport{ singer, Author = "Singer, Michael F.", date-added = "2022-12-20 11:43:36 +0100", date-modified = "2022-12-20 11:44:03 +0100", Title = "Algebraic Solutions of nth Order Linear Differential Equations", File = "Algebraic Solutions of nth Order Linear Differential Equations - algsolns.pdf" }