@article{Lambert:TCS:1992,
    Address = {Essex, UK},
    Author = {Lambert, J. L.},
    File = {A structure to decide reachability in Petri nets - Lambert (0) (0) - a - a - q.pdf},
    ISSN = {0304-3975},
    Journal = {Theor. Comput. Sci.},
    Keywords = {vector addition systems and Petri nets},
    Month = {June},
    Number = {1},
    Pages = {79--104},
    Publisher = {Elsevier Science Publishers Ltd.},
    Title = {A structure to decide reachability in Petri nets},
    URL = {http://dx.doi.org/10.1016/0304-3975(92)90173-D},
    Volume = {99},
    Year = {1992},
    acmid = {147626},
    bdsk-url-1 = {http://dx.doi.org/10.1016/0304-3975(92)90173-D},
    date-added = {2013-11-11 12:29:12 +0000},
    date-modified = {2017-04-06 15:46:47 +0000},
    issue_date = {June 1992},
    numpages = {26},
    doi = {10.1016/0304-3975(92)90173-D}
}

@article{Lambert:TCS:1992, Address = {Essex, UK}, Author = {Lambert, J. L.}, File = {A structure to decide reachability in Petri nets - Lambert (0) (0) - a - a - q.pdf}, ISSN = {0304-3975}, Journal = {Theor. Comput. Sci.}, Keywords = {vector addition systems and Petri nets}, Month = {June}, Number = {1}, Pages = {79--104}, Publisher = {Elsevier Science Publishers Ltd.}, Title = {A structure to decide reachability in Petri nets}, URL = {http://dx.doi.org/10.1016/0304-3975(92)90173-D}, Volume = {99}, Year = {1992}, acmid = {147626}, bdsk-url-1 = {http://dx.doi.org/10.1016/0304-3975(92)90173-D}, date-added = {2013-11-11 12:29:12 +0000}, date-modified = {2017-04-06 15:46:47 +0000}, issue_date = {June 1992}, numpages = {26}, doi = {10.1016/0304-3975(92)90173-D} }