@ARTICLE\{IMM1989-01896,
    author       = "M. R. Hansen and B. S. Hansen and P. Lucas",
    title        = "Integrating Relational Databases and Constraint Languages",
    year         = "1989",
    pages        = "63-82",
    journal      = "Computer Languages",
    volume       = "14",
    editor       = "",
    number       = "2",
    publisher    = "",
    url          = "http://www2.compute.dtu.dk/pubdb/pubs/1896-full.html"
}