@article{Tan_2010,
    doi = {10.1016/j.jcss.2010.03.004},
    url = {https://doi.org/10.1016%2Fj.jcss.2010.03.004},
    year = {2010},
    month = {dec},
    publisher = {Elsevier {BV}},
    volume = {76},
    number = {8},
    pages = {778--791},
    author = {Tony Tan},
    title = {On pebble automata for data languages with decidable emptiness problem},
    journal = {Journal of Computer and System Sciences}
}

@article{Tan_2010, doi = {10.1016/j.jcss.2010.03.004}, url = {https://doi.org/10.1016%2Fj.jcss.2010.03.004}, year = {2010}, month = {dec}, publisher = {Elsevier {BV}}, volume = {76}, number = {8}, pages = {778--791}, author = {Tony Tan}, title = {On pebble automata for data languages with decidable emptiness problem}, journal = {Journal of Computer and System Sciences} }