@inproceedings{Xi_1999,
    doi = {10.1145/292540.292560},
    url = {https://doi.org/10.1145%2F292540.292560},
    year = {1999},
    month = {jan},
    publisher = {{ACM}},
    author = {Hongwei Xi and Frank Pfenning},
    title = {Dependent types in practical programming},
    booktitle = {Proceedings of the 26th {ACM} {SIGPLAN}-{SIGACT} symposium on Principles of programming languages}
}

@inproceedings{Xi_1999, doi = {10.1145/292540.292560}, url = {https://doi.org/10.1145%2F292540.292560}, year = {1999}, month = {jan}, publisher = {{ACM}}, author = {Hongwei Xi and Frank Pfenning}, title = {Dependent types in practical programming}, booktitle = {Proceedings of the 26th {ACM} {SIGPLAN}-{SIGACT} symposium on Principles of programming languages} }