@article{Jurdzi_ski_2011,
    doi = {10.1145/1929954.1929956},
    url = {https://doi.org/10.1145%2F1929954.1929956},
    year = {2011},
    month = {may},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {12},
    number = {3},
    pages = {1--21},
    author = {Marcin Jurdzi{\'{n}}ski and Ranko Lazi{\'{c}}},
    title = {Alternating automata on data trees and {XPath} satisfiability},
    journal = {{ACM} Transactions on Computational Logic}
}

@article{Jurdzi_ski_2011, doi = {10.1145/1929954.1929956}, url = {https://doi.org/10.1145%2F1929954.1929956}, year = {2011}, month = {may}, publisher = {Association for Computing Machinery ({ACM})}, volume = {12}, number = {3}, pages = {1--21}, author = {Marcin Jurdzi{\'{n}}ski and Ranko Lazi{\'{c}}}, title = {Alternating automata on data trees and {XPath} satisfiability}, journal = {{ACM} Transactions on Computational Logic} }