@Manual{          RobertsonSeymourThomas,
  Author        = "Robertson, Neil and Seymour, Paul and Thomas, Robin",
  date-added    = "2016-12-27 17:28:39 +0000",
  date-modified = "2016-12-27 17:29:47 +0000",
  Title         = "Structural Descriptions of Lower Ideals of Trees",
  File          = "Structural Descriptions of Lower Ideals of Trees - Robertson, Seymour, Thomas (0) (0) - a - a - r.pdf"
}

@Manual{ RobertsonSeymourThomas, Author = "Robertson, Neil and Seymour, Paul and Thomas, Robin", date-added = "2016-12-27 17:28:39 +0000", date-modified = "2016-12-27 17:29:47 +0000", Title = "Structural Descriptions of Lower Ideals of Trees", File = "Structural Descriptions of Lower Ideals of Trees - Robertson, Seymour, Thomas (0) (0) - a - a - r.pdf" }