@article{B_r_ny_2015,
    doi = {10.1145/2701414},
    url = {https://doi.org/10.1145%2F2701414},
    year = {2015},
    month = {jun},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {62},
    number = {3},
    pages = {1--26},
    author = {Vince B{\'{a}}r{\'{a}}ny and Balder Ten Cate and Luc Segoufin},
    title = {Guarded Negation},
    journal = {Journal of the {ACM}}
}

@article{B_r_ny_2015, doi = {10.1145/2701414}, url = {https://doi.org/10.1145%2F2701414}, year = {2015}, month = {jun}, publisher = {Association for Computing Machinery ({ACM})}, volume = {62}, number = {3}, pages = {1--26}, author = {Vince B{\'{a}}r{\'{a}}ny and Balder Ten Cate and Luc Segoufin}, title = {Guarded Negation}, journal = {Journal of the {ACM}} }