@INPROCEEDINGS{ru:ecai98,
        TITLE = "Constraints with Variables'~Annotations",
        AUTHOR = "Hana Rudov\'{a}",
        BOOKTITLE = "13th European Conference on Artificial Intelligence
                     Proceedings",
        EDITOR = "Henri Prade",
        PUBLISHER = "John Wiley \& Sons, Ltd.",
        ADRESS = "Brighton, UK",
        PAGES = {261--262},
        YEAR = 1998,
}