@incollection{Fernau_2019,
    doi = {10.1007/978-3-030-13435-8_1},
    url = {https://doi.org/10.1007%2F978-3-030-13435-8_1},
    year = {2019},
    publisher = {Springer International Publishing},
    pages = {3--30},
    author = {Henning Fernau},
    title = {Modern Aspects of Complexity Within Formal Languages},
    booktitle = {Language and Automata Theory and Applications}
}

@incollection{Fernau_2019, doi = {10.1007/978-3-030-13435-8_1}, url = {https://doi.org/10.1007%2F978-3-030-13435-8_1}, year = {2019}, publisher = {Springer International Publishing}, pages = {3--30}, author = {Henning Fernau}, title = {Modern Aspects of Complexity Within Formal Languages}, booktitle = {Language and Automata Theory and Applications} }