@article{Zetzsche_2021,
    doi = {10.1016/j.ic.2020.104583},
    url = {https://doi.org/10.1016%2Fj.ic.2020.104583},
    year = {2021},
    month = {apr},
    publisher = {Elsevier {BV}},
    volume = {277},
    pages = {104583},
    author = {Georg Zetzsche},
    title = {The emptiness problem for valence automata over graph monoids},
    journal = {Information and Computation}
}

@article{Zetzsche_2021, doi = {10.1016/j.ic.2020.104583}, url = {https://doi.org/10.1016%2Fj.ic.2020.104583}, year = {2021}, month = {apr}, publisher = {Elsevier {BV}}, volume = {277}, pages = {104583}, author = {Georg Zetzsche}, title = {The emptiness problem for valence automata over graph monoids}, journal = {Information and Computation} }