@article{Andr_ka_1998,
    doi = {10.1023/a:1004275029985},
    url = {https://doi.org/10.1023%2Fa%3A1004275029985},
    year = {1998},
    month = {jun},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {27},
    number = {3},
    pages = {217--274},
    author = {Hajnal Andr{\'{e}}ka and Istv{\'{a}}n N{\'{e}}meti and Johan van Benthem},
    title = {Modal Languages and Bounded Fragments of Predicate Logic},
    journal = {Journal of Philosophical Logic}
}

@article{Andr_ka_1998, doi = {10.1023/a:1004275029985}, url = {https://doi.org/10.1023%2Fa%3A1004275029985}, year = {1998}, month = {jun}, publisher = {Springer Science and Business Media {LLC}}, volume = {27}, number = {3}, pages = {217--274}, author = {Hajnal Andr{\'{e}}ka and Istv{\'{a}}n N{\'{e}}meti and Johan van Benthem}, title = {Modal Languages and Bounded Fragments of Predicate Logic}, journal = {Journal of Philosophical Logic} }