@Unpublished{     franks,
  Author        = "Franks, Curtis",
  date-added    = "2020-09-14 10:19:01 +0200",
  date-modified = "2020-09-14 10:19:17 +0200",
  Title         = "Glivenko's Theorem",
  File          = "Glivenko's Theorem - a - s.pdf"
}

@Unpublished{ franks, Author = "Franks, Curtis", date-added = "2020-09-14 10:19:01 +0200", date-modified = "2020-09-14 10:19:17 +0200", Title = "Glivenko's Theorem", File = "Glivenko's Theorem - a - s.pdf" }