@CONFERENCE\{IMM1990-01603,
    author       = "H. Riis Nielson and F. Nielson",
    title        = "Eureka Definitions for Free! -or- Disagreement  Points for Fold/Unfold Transformations",
    year         = "1990",
    pages        = "291-305",
    booktitle    = "Proc. {ESOP'}90",
    volume       = "432",
    series       = "Lecture Notes in Computer Science",
    editor       = "",
    publisher    = "Springer-Verlag",
    organization = "",
    address      = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1603-full.html"
}