@inproceedings{MacQueen_1986,
    doi = {10.1145/512644.512670},
    url = {https://doi.org/10.1145%2F512644.512670},
    year = {1986},
    publisher = {{ACM} Press},
    author = {David B. MacQueen},
    title = {Using dependent types to express modular structure},
    booktitle = {Proceedings of the 13th {ACM} {SIGACT}-{SIGPLAN} symposium on Principles of programming languages  - {POPL} {\textquotesingle}86}
}

@inproceedings{MacQueen_1986, doi = {10.1145/512644.512670}, url = {https://doi.org/10.1145%2F512644.512670}, year = {1986}, publisher = {{ACM} Press}, author = {David B. MacQueen}, title = {Using dependent types to express modular structure}, booktitle = {Proceedings of the 13th {ACM} {SIGACT}-{SIGPLAN} symposium on Principles of programming languages - {POPL} {\textquotesingle}86} }