@INPROCEEDINGS{agi94,
    AUTHOR = "C. Andr\'e and D. Gaff\'e",
    TITLE = "Coop\'eration {\sc Grafcet/Est\'erel}",
    YEAR = {1994},
    PAGES = {221--224},
    BOOKTITLE = {Colloque AGI'94},
    PUBLISHER= {Association AGI},
    ADDRESS = {Poitiers},
    MONTH = {Juin}
}