@article{Ibarra:1978:RMM:322047.322058,
    Address = {New York, NY, USA},
    Author = {Ibarra, Oscar H.},
    File = {Reversal-Bounded Multicounter Machines and Their Decision Problems - Ibarra (0) (0) - a - a - o.pdf},
    ISSN = {0004-5411},
    Journal = {J. ACM},
    Month = {January},
    Number = {1},
    Pages = {116--133},
    Publisher = {ACM},
    Title = {Reversal-Bounded Multicounter Machines and Their Decision Problems},
    URL = {http://doi.acm.org/10.1145/322047.322058},
    Volume = {25},
    Year = {1978},
    acmid = {322058},
    bdsk-url-1 = {http://doi.acm.org/10.1145/322047.322058},
    bdsk-url-2 = {http://dx.doi.org/10.1145/322047.322058},
    date-added = {2013-11-30 16:45:43 +0000},
    date-modified = {2013-11-30 16:45:43 +0000},
    issue_date = {Jan. 1978},
    numpages = {18},
    doi = {10.1145/322047.322058}
}

@article{Ibarra:1978:RMM:322047.322058, Address = {New York, NY, USA}, Author = {Ibarra, Oscar H.}, File = {Reversal-Bounded Multicounter Machines and Their Decision Problems - Ibarra (0) (0) - a - a - o.pdf}, ISSN = {0004-5411}, Journal = {J. ACM}, Month = {January}, Number = {1}, Pages = {116--133}, Publisher = {ACM}, Title = {Reversal-Bounded Multicounter Machines and Their Decision Problems}, URL = {http://doi.acm.org/10.1145/322047.322058}, Volume = {25}, Year = {1978}, acmid = {322058}, bdsk-url-1 = {http://doi.acm.org/10.1145/322047.322058}, bdsk-url-2 = {http://dx.doi.org/10.1145/322047.322058}, date-added = {2013-11-30 16:45:43 +0000}, date-modified = {2013-11-30 16:45:43 +0000}, issue_date = {Jan. 1978}, numpages = {18}, doi = {10.1145/322047.322058} }