@article{Chv_tal_1988,
    doi = {10.1145/48014.48016},
    url = {https://doi.org/10.1145%2F48014.48016},
    year = {1988},
    month = {oct},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {35},
    number = {4},
    pages = {759--768},
    author = {Va{\v{s}}ek Chv{\'{a}}tal and Endre Szemer{\'{e}}di},
    title = {Many hard examples for resolution},
    journal = {Journal of the {ACM}}
}

@article{Chv_tal_1988, doi = {10.1145/48014.48016}, url = {https://doi.org/10.1145%2F48014.48016}, year = {1988}, month = {oct}, publisher = {Association for Computing Machinery ({ACM})}, volume = {35}, number = {4}, pages = {759--768}, author = {Va{\v{s}}ek Chv{\'{a}}tal and Endre Szemer{\'{e}}di}, title = {Many hard examples for resolution}, journal = {Journal of the {ACM}} }