@incollection{Deutsch_2002,
    doi = {10.1007/3-540-46093-4_2},
    url = {https://doi.org/10.1007%2F3-540-46093-4_2},
    year = {2002},
    publisher = {Springer Berlin Heidelberg},
    pages = {21--39},
    author = {Alin Deutsch and Val Tannen},
    title = {Optimization Properties for Classes of Conjunctive Regular Path Queries},
    booktitle = {Database Programming Languages}
}

@incollection{Deutsch_2002, doi = {10.1007/3-540-46093-4_2}, url = {https://doi.org/10.1007%2F3-540-46093-4_2}, year = {2002}, publisher = {Springer Berlin Heidelberg}, pages = {21--39}, author = {Alin Deutsch and Val Tannen}, title = {Optimization Properties for Classes of Conjunctive Regular Path Queries}, booktitle = {Database Programming Languages} }