@article{Karhum_ki_2000,
    doi = {10.1145/337244.337255},
    url = {https://doi.org/10.1145%2F337244.337255},
    year = {2000},
    month = {may},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {47},
    number = {3},
    pages = {483--505},
    author = {Juhani Karhumäki and Filippo Mignosi and Wojciech Plandowski},
    title = {The expressibility of languages and relations by word equations},
    journal = {Journal of the {ACM}}
}

@article{Karhum_ki_2000, doi = {10.1145/337244.337255}, url = {https://doi.org/10.1145%2F337244.337255}, year = {2000}, month = {may}, publisher = {Association for Computing Machinery ({ACM})}, volume = {47}, number = {3}, pages = {483--505}, author = {Juhani Karhumäki and Filippo Mignosi and Wojciech Plandowski}, title = {The expressibility of languages and relations by word equations}, journal = {Journal of the {ACM}} }