@ARTICLE\{IMM1983-01769,
    author       = "H. Riis Nielson",
    title        = "Computation Sequences: A Way to Characterize Classes of Attribute Grammars",
    year         = "1983",
    pages        = "255-268",
    journal      = "Acta Informatica",
    volume       = "19",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1769-full.html"
}