@CONFERENCE\{IMM1996-01872,
    author       = "A. E. Haxthausen and A. Nickl",
    title        = "Pushouts of Order-sorted Algebraic Specifications",
    year         = "1996",
    booktitle    = "Proceedings of {AMAST'}96",
    volume       = "",
    series       = "Lecture Notes in Computer Science",
    editor       = "",
    publisher    = "Springer-Verlag",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1872-full.html"
}