@inproceedings{Valiant_1979,
    doi = {10.1145/800135.804419},
    url = {https://doi.org/10.1145%2F800135.804419},
    year = {1979},
    publisher = {{ACM} Press},
    author = {L. G. Valiant},
    title = {Completeness classes in algebra},
    booktitle = {Proceedings of the eleventh annual {ACM} symposium on Theory of computing  - {STOC} {\textquotesingle}79}
}

@inproceedings{Valiant_1979, doi = {10.1145/800135.804419}, url = {https://doi.org/10.1145%2F800135.804419}, year = {1979}, publisher = {{ACM} Press}, author = {L. G. Valiant}, title = {Completeness classes in algebra}, booktitle = {Proceedings of the eleventh annual {ACM} symposium on Theory of computing - {STOC} {\textquotesingle}79} }