@article{JezOkhotin:2010,
    Author = {Je{\.z}, Artur and Okhotin, Alexander},
    File = {Conjunctive Grammars over a Unary Alphabet Undecidability and Unbounded Growth - Jeż, Okhotin (0) (0) - a - a - a.pdf},
    ISSN = {1432-4350},
    Journal = {Theory of Computing Systems},
    Keywords = {Conjunctive grammars; Unary languages; Language equations; Trellis automata; Cellular automata},
    Language = {English},
    Number = {1},
    Pages = {27-58},
    Publisher = {Springer-Verlag},
    Title = {Conjunctive Grammars over a Unary Alphabet: Undecidability and Unbounded Growth},
    URL = {http://dx.doi.org/10.1007/s00224-008-9139-5},
    Volume = {46},
    Year = {2010},
    bdsk-url-1 = {http://dx.doi.org/10.1007/s00224-008-9139-5},
    date-added = {2015-03-13 11:08:07 +0000},
    date-modified = {2015-03-13 11:08:07 +0000},
    doi = {10.1007/s00224-008-9139-5}
}

@article{JezOkhotin:2010, Author = {Je{.z}, Artur and Okhotin, Alexander}, File = {Conjunctive Grammars over a Unary Alphabet Undecidability and Unbounded Growth - Jeż, Okhotin (0) (0) - a - a - a.pdf}, ISSN = {1432-4350}, Journal = {Theory of Computing Systems}, Keywords = {Conjunctive grammars; Unary languages; Language equations; Trellis automata; Cellular automata}, Language = {English}, Number = {1}, Pages = {27-58}, Publisher = {Springer-Verlag}, Title = {Conjunctive Grammars over a Unary Alphabet: Undecidability and Unbounded Growth}, URL = {http://dx.doi.org/10.1007/s00224-008-9139-5}, Volume = {46}, Year = {2010}, bdsk-url-1 = {http://dx.doi.org/10.1007/s00224-008-9139-5}, date-added = {2015-03-13 11:08:07 +0000}, date-modified = {2015-03-13 11:08:07 +0000}, doi = {10.1007/s00224-008-9139-5} }