@inproceedings{Nisan_1991,
    doi = {10.1145/103418.103462},
    url = {https://doi.org/10.1145%2F103418.103462},
    year = {1991},
    publisher = {{ACM} Press},
    author = {Noam Nisan},
    title = {Lower bounds for non-commutative computation},
    booktitle = {Proceedings of the twenty-third annual {ACM} symposium on Theory of computing  - {STOC} {\textquotesingle}91}
}

@inproceedings{Nisan_1991, doi = {10.1145/103418.103462}, url = {https://doi.org/10.1145%2F103418.103462}, year = {1991}, publisher = {{ACM} Press}, author = {Noam Nisan}, title = {Lower bounds for non-commutative computation}, booktitle = {Proceedings of the twenty-third annual {ACM} symposium on Theory of computing - {STOC} {\textquotesingle}91} }