@Unpublished{Bau99,
    Author       = "Baumgartner, P.",
    Year         = "1999",
    Title        = "{FTP'2000 - Problem Sets}",
    Note         = "ftp://ftphost.uni-koblenz.de/outgoing/agki/FTP2000/ProblemSets/index.html",
    Comment      = "TPTPRef"
}