@article{Kadioglu_2009,
    doi = {10.1007/s10601-009-9073-4},
    url = {https://doi.org/10.1007%2Fs10601-009-9073-4},
    year = {2009},
    month = {jul},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {15},
    number = {1},
    pages = {117--144},
    author = {Serdar Kadioglu and Meinolf Sellmann},
    title = {Grammar constraints},
    journal = {Constraints}
}

@article{Kadioglu_2009, doi = {10.1007/s10601-009-9073-4}, url = {https://doi.org/10.1007%2Fs10601-009-9073-4}, year = {2009}, month = {jul}, publisher = {Springer Science and Business Media {LLC}}, volume = {15}, number = {1}, pages = {117--144}, author = {Serdar Kadioglu and Meinolf Sellmann}, title = {Grammar constraints}, journal = {Constraints} }