@inproceedings{Hong_1990,
    doi = {10.1145/96877.96943},
    url = {https://doi.org/10.1145%2F96877.96943},
    year = {1990},
    month = {jul},
    publisher = {{ACM}},
    author = {H. Hong},
    title = {An improvement of the projection operator in cylindrical algebraic decomposition},
    booktitle = {Proceedings of the international symposium on Symbolic and algebraic computation}
}

@inproceedings{Hong_1990, doi = {10.1145/96877.96943}, url = {https://doi.org/10.1145%2F96877.96943}, year = {1990}, month = {jul}, publisher = {{ACM}}, author = {H. Hong}, title = {An improvement of the projection operator in cylindrical algebraic decomposition}, booktitle = {Proceedings of the international symposium on Symbolic and algebraic computation} }