@ARTICLE\{IMM1989-01549,
    author       = "F. Nielson",
    title        = "Two-Level Semantics and Abstract Interpretation",
    year         = "1989",
    pages        = "117-242",
    journal      = "Theoretical Computer Science --  Fundamental Studies",
    volume       = "69",
    editor       = "",
    number       = "",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1549-full.html"
}