@Misc{            konig,
  date-added    = "2017-09-19 06:47:49 +0000",
  date-modified = "2017-09-19 06:48:29 +0000",
  Title         = "Konig's infinity lemma and Beth's tree theorem",
  File          = "Konig 3 (0) - a - a - i.pdf"
}

@Misc{ konig, date-added = "2017-09-19 06:47:49 +0000", date-modified = "2017-09-19 06:48:29 +0000", Title = "Konig's infinity lemma and Beth's tree theorem", File = "Konig 3 (0) - a - a - i.pdf" }