@MASTERSTHESIS\{IMM1980-01530,
    author       = "H. Riis",
    title        = "Subclasses of Attribute Grammars",
    year         = "1980",
    school       = "Computer Science Department, Aarhus University",
    address      = "",
    type         = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1530-full.html"
}