@ARTICLE\{IMM1997-02078,
    author       = "P. Fischer and K. U. Hoeffgen and H. Lefmann",
    title        = "PAC-Learning from General Examples",
    year         = "1997",
    pages        = "43-65",
    journal      = "Theoretical Computer Science",
    volume       = "172",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/2078-full.html"
}