@incollection{Colcombet_2008,
    doi = {10.1007/978-3-540-87531-4_30},
    url = {https://doi.org/10.1007%2F978-3-540-87531-4_30},
    year = {2008},
    publisher = {Springer Berlin Heidelberg},
    pages = {416--430},
    author = {Thomas Colcombet and Christof Löding},
    title = {The Nesting-Depth of Disjunctive {$\mu$}-Calculus for Tree Languages and the Limitedness Problem},
    booktitle = {Computer Science Logic}
}

@incollection{Colcombet_2008, doi = {10.1007/978-3-540-87531-4_30}, url = {https://doi.org/10.1007%2F978-3-540-87531-4_30}, year = {2008}, publisher = {Springer Berlin Heidelberg}, pages = {416--430}, author = {Thomas Colcombet and Christof Löding}, title = {The Nesting-Depth of Disjunctive {$\mu$}-Calculus for Tree Languages and the Limitedness Problem}, booktitle = {Computer Science Logic} }