@article{Potechin_2020,
    doi = {10.1016/j.ipl.2020.105993},
    url = {https://doi.org/10.1016%2Fj.ipl.2020.105993},
    year = {2020},
    month = {oct},
    publisher = {Elsevier {BV}},
    volume = {162},
    pages = {105993},
    author = {Aaron Potechin and Jeffrey Shallit},
    title = {Lengths of words accepted by nondeterministic finite automata},
    journal = {Information Processing Letters}
}

@article{Potechin_2020, doi = {10.1016/j.ipl.2020.105993}, url = {https://doi.org/10.1016%2Fj.ipl.2020.105993}, year = {2020}, month = {oct}, publisher = {Elsevier {BV}}, volume = {162}, pages = {105993}, author = {Aaron Potechin and Jeffrey Shallit}, title = {Lengths of words accepted by nondeterministic finite automata}, journal = {Information Processing Letters} }