@incollection{Droste_2017,
    doi = {10.1007/978-3-319-63121-9_2},
    url = {https://doi.org/10.1007%2F978-3-319-63121-9_2},
    year = {2017},
    publisher = {Springer International Publishing},
    pages = {22--35},
    author = {Manfred Droste and Doreen Götze},
    title = {A Nivat Theorem for Quantitative Automata on Unranked Trees},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Droste_2017, doi = {10.1007/978-3-319-63121-9_2}, url = {https://doi.org/10.1007%2F978-3-319-63121-9_2}, year = {2017}, publisher = {Springer International Publishing}, pages = {22--35}, author = {Manfred Droste and Doreen Götze}, title = {A Nivat Theorem for Quantitative Automata on Unranked Trees}, booktitle = {Lecture Notes in Computer Science} }