@article{Pighizzini2002393,
    Author = {Pighizzini, Giovanni and Shallit, Jeffrey and Wang, Ming-wei},
    File = {Unary Context-Free Grammars and Pushdown Automata, Descriptional Complexity and Auxiliary Space Lower Bounds - Pighizzini, Shallit, Wang (0) (0) - a - a - u.pdf},
    ISSN = {0022-0000},
    Journal = {Journal of Computer and System Sciences},
    Number = {2},
    Pages = {393 - 414},
    Title = {Unary Context-Free Grammars and Pushdown Automata, Descriptional Complexity and Auxiliary Space Lower Bounds},
    URL = {http://www.sciencedirect.com/science/article/pii/S0022000002918556},
    Volume = {65},
    Year = {2002},
    bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S0022000002918556},
    bdsk-url-2 = {http://dx.doi.org/10.1006/jcss.2002.1855},
    date-added = {2014-01-23 10:33:08 +0000},
    date-modified = {2014-01-23 10:33:33 +0000},
    doi = {10.1006/jcss.2002.1855}
}

@article{Pighizzini2002393, Author = {Pighizzini, Giovanni and Shallit, Jeffrey and Wang, Ming-wei}, File = {Unary Context-Free Grammars and Pushdown Automata, Descriptional Complexity and Auxiliary Space Lower Bounds - Pighizzini, Shallit, Wang (0) (0) - a - a - u.pdf}, ISSN = {0022-0000}, Journal = {Journal of Computer and System Sciences}, Number = {2}, Pages = {393 - 414}, Title = {Unary Context-Free Grammars and Pushdown Automata, Descriptional Complexity and Auxiliary Space Lower Bounds}, URL = {http://www.sciencedirect.com/science/article/pii/S0022000002918556}, Volume = {65}, Year = {2002}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S0022000002918556}, bdsk-url-2 = {http://dx.doi.org/10.1006/jcss.2002.1855}, date-added = {2014-01-23 10:33:08 +0000}, date-modified = {2014-01-23 10:33:33 +0000}, doi = {10.1006/jcss.2002.1855} }