@CONFERENCE\{IMM1989-01855,
    author       = "A. E. Haxthausen",
    title        = "Recursive Algebraic Specifications and their Semantics",
    year         = "1989",
    booktitle    = "Proceedings of the {IFIP'}89",
    volume       = "",
    series       = "",
    editor       = "",
    publisher    = "North-Holland",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1855-full.html"
}