@article{L_ding_2017,
    doi = {10.1145/3158098},
    url = {https://doi.org/10.1145%2F3158098},
    year = {2017},
    month = {dec},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {2},
    number = {{POPL}},
    pages = {1--30},
    author = {Christof Löding and P. Madhusudan and Lucas Pe{\~{n}}a},
    title = {Foundations for natural proofs and quantifier instantiation},
    journal = {Proceedings of the {ACM} on Programming Languages}
}

@article{L_ding_2017, doi = {10.1145/3158098}, url = {https://doi.org/10.1145%2F3158098}, year = {2017}, month = {dec}, publisher = {Association for Computing Machinery ({ACM})}, volume = {2}, number = {{POPL}}, pages = {1--30}, author = {Christof Löding and P. Madhusudan and Lucas Pe{\~{n}}a}, title = {Foundations for natural proofs and quantifier instantiation}, journal = {Proceedings of the {ACM} on Programming Languages} }