@article{Dittmann_2016,
    doi = {10.1016/j.tcs.2015.11.044},
    url = {https://doi.org/10.1016%2Fj.tcs.2015.11.044},
    year = {2016},
    month = {feb},
    publisher = {Elsevier {BV}},
    volume = {614},
    pages = {97--108},
    author = {Christoph Dittmann and Stephan Kreutzer and Alexandru I. Tomescu},
    title = {Graph operations on parity games and polynomial-time algorithms},
    journal = {Theoretical Computer Science}
}

@article{Dittmann_2016, doi = {10.1016/j.tcs.2015.11.044}, url = {https://doi.org/10.1016%2Fj.tcs.2015.11.044}, year = {2016}, month = {feb}, publisher = {Elsevier {BV}}, volume = {614}, pages = {97--108}, author = {Christoph Dittmann and Stephan Kreutzer and Alexandru I. Tomescu}, title = {Graph operations on parity games and polynomial-time algorithms}, journal = {Theoretical Computer Science} }