@inproceedings{Cruz_1987,
    doi = {10.1145/38713.38749},
    url = {https://doi.org/10.1145%2F38713.38749},
    year = {1987},
    publisher = {{ACM} Press},
    author = {Isabel F. Cruz and Alberto O. Mendelzon and Peter T. Wood},
    title = {A graphical query language supporting recursion},
    booktitle = {Proceedings of the 1987 {ACM} {SIGMOD} international conference on Management of data  - {SIGMOD} {\textquotesingle}87}
}

@inproceedings{Cruz_1987, doi = {10.1145/38713.38749}, url = {https://doi.org/10.1145%2F38713.38749}, year = {1987}, publisher = {{ACM} Press}, author = {Isabel F. Cruz and Alberto O. Mendelzon and Peter T. Wood}, title = {A graphical query language supporting recursion}, booktitle = {Proceedings of the 1987 {ACM} {SIGMOD} international conference on Management of data - {SIGMOD} {\textquotesingle}87} }