@article{Dang:PTA:2003,
    Address = {Essex, UK},
    Author = {Dang, Zhe},
    File = {Pushdown timed automata a binary reachability characterization and safety verification - Dang (0) (0) - a - a - g.pdf},
    ISSN = {0304-3975},
    Journal = {Theor. Comput. Sci.},
    Keywords = {pushdown automata and timed automata},
    Month = {June},
    Number = {1-3},
    Pages = {93--121},
    Publisher = {Elsevier Science Publishers Ltd.},
    Title = {Pushdown timed automata: a binary reachability characterization and safety verification},
    URL = {http://dx.doi.org/10.1016/S0304-3975(02)00743-0},
    Volume = {302},
    Year = {2003},
    acmid = {860209},
    bdsk-url-1 = {http://dx.doi.org/10.1016/S0304-3975(02)00743-0},
    date-added = {2013-10-21 15:01:17 +0000},
    date-modified = {2014-10-16 14:33:07 +0000},
    issue_date = {13 June 2003},
    numpages = {29},
    doi = {10.1016/S0304-3975(02)00743-0}
}

@article{Dang:PTA:2003, Address = {Essex, UK}, Author = {Dang, Zhe}, File = {Pushdown timed automata a binary reachability characterization and safety verification - Dang (0) (0) - a - a - g.pdf}, ISSN = {0304-3975}, Journal = {Theor. Comput. Sci.}, Keywords = {pushdown automata and timed automata}, Month = {June}, Number = {1-3}, Pages = {93--121}, Publisher = {Elsevier Science Publishers Ltd.}, Title = {Pushdown timed automata: a binary reachability characterization and safety verification}, URL = {http://dx.doi.org/10.1016/S0304-3975(02)00743-0}, Volume = {302}, Year = {2003}, acmid = {860209}, bdsk-url-1 = {http://dx.doi.org/10.1016/S0304-3975(02)00743-0}, date-added = {2013-10-21 15:01:17 +0000}, date-modified = {2014-10-16 14:33:07 +0000}, issue_date = {13 June 2003}, numpages = {29}, doi = {10.1016/S0304-3975(02)00743-0} }