@incollection{Berwanger_2005,
    doi = {10.1007/978-3-540-32275-7_15},
    url = {https://doi.org/10.1007%2F978-3-540-32275-7_15},
    year = {2005},
    publisher = {Springer Berlin Heidelberg},
    pages = {209--223},
    author = {Dietmar Berwanger and Erich Grädel},
    title = {Entanglement {\textendash} A Measure for the Complexity of Directed Graphs with Applications to Logic and Games},
    booktitle = {Logic for Programming, Artificial Intelligence, and Reasoning}
}

@incollection{Berwanger_2005, doi = {10.1007/978-3-540-32275-7_15}, url = {https://doi.org/10.1007%2F978-3-540-32275-7_15}, year = {2005}, publisher = {Springer Berlin Heidelberg}, pages = {209--223}, author = {Dietmar Berwanger and Erich Grädel}, title = {Entanglement {\textendash} A Measure for the Complexity of Directed Graphs with Applications to Logic and Games}, booktitle = {Logic for Programming, Artificial Intelligence, and Reasoning} }