@incollection{Niehren_1993,
    doi = {10.1007/3-540-56610-4_76},
    url = {https://doi.org/10.1007%2F3-540-56610-4_76},
    year = {1993},
    publisher = {Springer Berlin Heidelberg},
    pages = {356--375},
    author = {Joachim Niehren and Andreas Podelski},
    title = {Feature automata and recognizable sets of feature trees},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Niehren_1993, doi = {10.1007/3-540-56610-4_76}, url = {https://doi.org/10.1007%2F3-540-56610-4_76}, year = {1993}, publisher = {Springer Berlin Heidelberg}, pages = {356--375}, author = {Joachim Niehren and Andreas Podelski}, title = {Feature automata and recognizable sets of feature trees}, booktitle = {Lecture Notes in Computer Science} }