@article{BERTONI1991325,
    Author = {Bertoni, Alberto and Goldwurm, Massimiliano and Sabadini, Nicoletta},
    File = {1-s2.0-030439759190023U-main (0) - a - a - b.pdf},
    ISSN = {0304-3975},
    Journal = {Theoretical Computer Science},
    Number = {2},
    Pages = {325 - 342},
    Title = {The complexity of computing the number of strings of given length in context-free languages},
    URL = {http://www.sciencedirect.com/science/article/pii/030439759190023U},
    Volume = {86},
    Year = {1991},
    bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/030439759190023U},
    bdsk-url-2 = {https://doi.org/10.1016/0304-3975(91)90023-U},
    date-added = {2018-10-16 13:43:55 +0000},
    date-modified = {2018-10-16 13:43:55 +0000},
    doi = {10.1016/0304-3975(91)90023-U}
}

@article{BERTONI1991325, Author = {Bertoni, Alberto and Goldwurm, Massimiliano and Sabadini, Nicoletta}, File = {1-s2.0-030439759190023U-main (0) - a - a - b.pdf}, ISSN = {0304-3975}, Journal = {Theoretical Computer Science}, Number = {2}, Pages = {325 - 342}, Title = {The complexity of computing the number of strings of given length in context-free languages}, URL = {http://www.sciencedirect.com/science/article/pii/030439759190023U}, Volume = {86}, Year = {1991}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/030439759190023U}, bdsk-url-2 = {https://doi.org/10.1016/0304-3975(91)90023-U}, date-added = {2018-10-16 13:43:55 +0000}, date-modified = {2018-10-16 13:43:55 +0000}, doi = {10.1016/0304-3975(91)90023-U} }