@article{Czeizler_2009,
    doi = {10.1016/j.tcs.2009.01.023},
    url = {https://doi.org/10.1016%2Fj.tcs.2009.01.023},
    year = {2009},
    month = {aug},
    publisher = {Elsevier {BV}},
    volume = {410},
    number = {30-32},
    pages = {2889--2909},
    author = {Elena Czeizler and Wojciech Plandowski},
    title = {On systems of word equations over three unknowns with at most six occurrences of one of the unknowns},
    journal = {Theoretical Computer Science}
}

@article{Czeizler_2009, doi = {10.1016/j.tcs.2009.01.023}, url = {https://doi.org/10.1016%2Fj.tcs.2009.01.023}, year = {2009}, month = {aug}, publisher = {Elsevier {BV}}, volume = {410}, number = {30-32}, pages = {2889--2909}, author = {Elena Czeizler and Wojciech Plandowski}, title = {On systems of word equations over three unknowns with at most six occurrences of one of the unknowns}, journal = {Theoretical Computer Science} }