@article{Smolka_2019,
    doi = {10.1145/3371129},
    url = {https://doi.org/10.1145%2F3371129},
    year = {2019},
    month = {dec},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {4},
    number = {{POPL}},
    pages = {1--28},
    author = {Steffen Smolka and Nate Foster and Justin Hsu and Tobias Kapp{\'{e}} and Dexter Kozen and Alexandra Silva},
    title = {Guarded Kleene algebra with tests: verification of uninterpreted programs in nearly linear time},
    journal = {Proceedings of the {ACM} on Programming Languages}
}

@article{Smolka_2019, doi = {10.1145/3371129}, url = {https://doi.org/10.1145%2F3371129}, year = {2019}, month = {dec}, publisher = {Association for Computing Machinery ({ACM})}, volume = {4}, number = {{POPL}}, pages = {1--28}, author = {Steffen Smolka and Nate Foster and Justin Hsu and Tobias Kapp{\'{e}} and Dexter Kozen and Alexandra Silva}, title = {Guarded Kleene algebra with tests: verification of uninterpreted programs in nearly linear time}, journal = {Proceedings of the {ACM} on Programming Languages} }