@inproceedings{BroersenAiML2002,
    author = {J.M. Broersen},
    title = {Relativized Action Negation for Dynamic Logics},
    booktitle = {Advances in Modal Logic},
    volume = {4},
    year = {2003},
    pages = {51--70},
    publisher = {},
    address = {},
    note = {},
    editor = {P. Balbiani and N-Y. Suzuki and F. Wolter and M. Zakharyaschev}}