@article{FRATANI2019104444,
    Abstract = {We study a family of context-free languages that reduce to ε in the free group and give several homomorphic characterizations of indexed languages relevant to that family.},
    Author = {Fratani, S{\'e}verine and Voundy, El Makki},
    ISSN = {0890-5401},
    Journal = {Information and Computation},
    Keywords = {Context-free grammars, Homomorphic characterizations, Transductions, Indexed languages},
    Pages = {104444},
    Title = {Epsilon-reducible context-free languages and characterizations of indexed languages},
    URL = {http://www.sciencedirect.com/science/article/pii/S0890540119300616},
    Year = {2019},
    bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S0890540119300616},
    bdsk-url-2 = {https://doi.org/10.1016/j.ic.2019.104444},
    date-added = {2019-08-31 16:50:06 +0200},
    date-modified = {2019-08-31 16:50:06 +0200},
    doi = {10.1016/j.ic.2019.104444}
}

@article{FRATANI2019104444, Abstract = {We study a family of context-free languages that reduce to ε in the free group and give several homomorphic characterizations of indexed languages relevant to that family.}, Author = {Fratani, S{\'e}verine and Voundy, El Makki}, ISSN = {0890-5401}, Journal = {Information and Computation}, Keywords = {Context-free grammars, Homomorphic characterizations, Transductions, Indexed languages}, Pages = {104444}, Title = {Epsilon-reducible context-free languages and characterizations of indexed languages}, URL = {http://www.sciencedirect.com/science/article/pii/S0890540119300616}, Year = {2019}, bdsk-url-1 = {http://www.sciencedirect.com/science/article/pii/S0890540119300616}, bdsk-url-2 = {https://doi.org/10.1016/j.ic.2019.104444}, date-added = {2019-08-31 16:50:06 +0200}, date-modified = {2019-08-31 16:50:06 +0200}, doi = {10.1016/j.ic.2019.104444} }