@article{Kanazawa_2014,
    doi = {10.1007/s00224-014-9534-z},
    url = {https://doi.org/10.1007%2Fs00224-014-9534-z},
    year = {2014},
    month = {jan},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {55},
    number = {1},
    pages = {250--278},
    author = {Makoto Kanazawa and Gregory M. Kobele and Jens Michaelis and Sylvain Salvati and Ryo Yoshinaka},
    title = {The Failure of the Strong Pumping Lemma for Multiple Context-Free Languages},
    journal = {Theory of Computing Systems}
}

@article{Kanazawa_2014, doi = {10.1007/s00224-014-9534-z}, url = {https://doi.org/10.1007%2Fs00224-014-9534-z}, year = {2014}, month = {jan}, publisher = {Springer Science and Business Media {LLC}}, volume = {55}, number = {1}, pages = {250--278}, author = {Makoto Kanazawa and Gregory M. Kobele and Jens Michaelis and Sylvain Salvati and Ryo Yoshinaka}, title = {The Failure of the Strong Pumping Lemma for Multiple Context-Free Languages}, journal = {Theory of Computing Systems} }