@article{Bridson:2002:CLS:639539.639546,
    Address = {Orlando, FL, USA},
    Author = {Bridson, Martin R. and Gilman, Robert H.},
    ISSN = {0022-0000},
    Journal = {J. Comput. Syst. Sci.},
    Keywords = {context-free languages, growth functions},
    Month = {March},
    Number = {2},
    Pages = {308--310},
    Publisher = {Academic Press, Inc.},
    Title = {Context-Free Languages of Sub-exponential Growth},
    URL = {http://dx.doi.org/10.1006/jcss.2001.1804},
    Volume = {64},
    Year = {2002},
    acmid = {639546},
    bdsk-url-1 = {http://dx.doi.org/10.1006/jcss.2001.1804},
    date-added = {2018-10-16 14:43:00 +0000},
    date-modified = {2018-10-16 14:43:00 +0000},
    issue_date = {March 2002},
    numpages = {3},
    doi = {10.1006/jcss.2001.1804}
}

@article{Bridson:2002:CLS:639539.639546, Address = {Orlando, FL, USA}, Author = {Bridson, Martin R. and Gilman, Robert H.}, ISSN = {0022-0000}, Journal = {J. Comput. Syst. Sci.}, Keywords = {context-free languages, growth functions}, Month = {March}, Number = {2}, Pages = {308--310}, Publisher = {Academic Press, Inc.}, Title = {Context-Free Languages of Sub-exponential Growth}, URL = {http://dx.doi.org/10.1006/jcss.2001.1804}, Volume = {64}, Year = {2002}, acmid = {639546}, bdsk-url-1 = {http://dx.doi.org/10.1006/jcss.2001.1804}, date-added = {2018-10-16 14:43:00 +0000}, date-modified = {2018-10-16 14:43:00 +0000}, issue_date = {March 2002}, numpages = {3}, doi = {10.1006/jcss.2001.1804} }