@inproceedings{Hillebrand_1994,
    doi = {10.1145/182591.182615},
    url = {https://doi.org/10.1145%2F182591.182615},
    year = {1994},
    publisher = {{ACM} Press},
    author = {Gerd G. Hillebrand and Paris C. Kanellakis},
    title = {Functional database query languages as typed lambda calculi of fixed order (extended abstract)},
    booktitle = {Proceedings of the thirteenth {ACM} {SIGACT}-{SIGMOD}-{SIGART} symposium on Principles of database systems  - {PODS} {\textquotesingle}94}
}

@inproceedings{Hillebrand_1994, doi = {10.1145/182591.182615}, url = {https://doi.org/10.1145%2F182591.182615}, year = {1994}, publisher = {{ACM} Press}, author = {Gerd G. Hillebrand and Paris C. Kanellakis}, title = {Functional database query languages as typed lambda calculi of fixed order (extended abstract)}, booktitle = {Proceedings of the thirteenth {ACM} {SIGACT}-{SIGMOD}-{SIGART} symposium on Principles of database systems - {PODS} {\textquotesingle}94} }