@inproceedings{Dreyer_2003,
    doi = {10.1145/604131.604151},
    url = {https://doi.org/10.1145%2F604131.604151},
    year = {2003},
    month = {jan},
    publisher = {{ACM}},
    author = {Derek Dreyer and Karl Crary and Robert Harper},
    title = {A type system for higher-order modules},
    booktitle = {Proceedings of the 30th {ACM} {SIGPLAN}-{SIGACT} symposium on Principles of programming languages}
}

@inproceedings{Dreyer_2003, doi = {10.1145/604131.604151}, url = {https://doi.org/10.1145%2F604131.604151}, year = {2003}, month = {jan}, publisher = {{ACM}}, author = {Derek Dreyer and Karl Crary and Robert Harper}, title = {A type system for higher-order modules}, booktitle = {Proceedings of the 30th {ACM} {SIGPLAN}-{SIGACT} symposium on Principles of programming languages} }