@article{Jeavons_1997,
    doi = {10.1145/263867.263489},
    url = {https://doi.org/10.1145%2F263867.263489},
    year = {1997},
    month = {jul},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {44},
    number = {4},
    pages = {527--548},
    author = {Peter Jeavons and David Cohen and Marc Gyssens},
    title = {Closure properties of constraints},
    journal = {Journal of the {ACM}}
}

@article{Jeavons_1997, doi = {10.1145/263867.263489}, url = {https://doi.org/10.1145%2F263867.263489}, year = {1997}, month = {jul}, publisher = {Association for Computing Machinery ({ACM})}, volume = {44}, number = {4}, pages = {527--548}, author = {Peter Jeavons and David Cohen and Marc Gyssens}, title = {Closure properties of constraints}, journal = {Journal of the {ACM}} }