@inproceedings{Fischer_1971,
    doi = {10.1109/swat.1971.4},
    url = {https://doi.org/10.1109%2Fswat.1971.4},
    year = {1971},
    month = {oct},
    publisher = {{IEEE}},
    author = {M. J. Fischer and A. R. Meyer},
    title = {Boolean matrix multiplication and transitive closure},
    booktitle = {12th Annual Symposium on Switching and Automata Theory (swat 1971)}
}

@inproceedings{Fischer_1971, doi = {10.1109/swat.1971.4}, url = {https://doi.org/10.1109%2Fswat.1971.4}, year = {1971}, month = {oct}, publisher = {{IEEE}}, author = {M. J. Fischer and A. R. Meyer}, title = {Boolean matrix multiplication and transitive closure}, booktitle = {12th Annual Symposium on Switching and Automata Theory (swat 1971)} }