@article{DeMol:2008:TSC:1328331.1328346,
    Address = {Essex, UK},
    Author = {De Mol, Liesbeth},
    File = {Tag Systems and Collatz-like Functions - De Mol (0) (0) - a - a - w.pdf},
    ISSN = {0304-3975},
    Journal = {Theor. Comput. Sci.},
    Keywords = {3n+1-problem, Collatz-like functions, Limits of solvability and unsolvability, Tag systems, Universality},
    Month = {January},
    Number = {1},
    Pages = {92--101},
    Publisher = {Elsevier Science Publishers Ltd.},
    Title = {Tag Systems and Collatz-like Functions},
    URL = {http://dx.doi.org/10.1016/j.tcs.2007.10.020},
    Volume = {390},
    Year = {2008},
    acmid = {1328346},
    bdsk-url-1 = {http://dx.doi.org/10.1016/j.tcs.2007.10.020},
    date-added = {2014-06-23 20:37:55 +0000},
    date-modified = {2014-06-23 20:37:55 +0000},
    issue_date = {January, 2008},
    numpages = {10},
    doi = {10.1016/j.tcs.2007.10.020}
}

@article{DeMol:2008:TSC:1328331.1328346, Address = {Essex, UK}, Author = {De Mol, Liesbeth}, File = {Tag Systems and Collatz-like Functions - De Mol (0) (0) - a - a - w.pdf}, ISSN = {0304-3975}, Journal = {Theor. Comput. Sci.}, Keywords = {3n+1-problem, Collatz-like functions, Limits of solvability and unsolvability, Tag systems, Universality}, Month = {January}, Number = {1}, Pages = {92--101}, Publisher = {Elsevier Science Publishers Ltd.}, Title = {Tag Systems and Collatz-like Functions}, URL = {http://dx.doi.org/10.1016/j.tcs.2007.10.020}, Volume = {390}, Year = {2008}, acmid = {1328346}, bdsk-url-1 = {http://dx.doi.org/10.1016/j.tcs.2007.10.020}, date-added = {2014-06-23 20:37:55 +0000}, date-modified = {2014-06-23 20:37:55 +0000}, issue_date = {January, 2008}, numpages = {10}, doi = {10.1016/j.tcs.2007.10.020} }