@inproceedings{Boja_czyk_2006,
    doi = {10.1145/1142351.1142354},
    url = {https://doi.org/10.1145%2F1142351.1142354},
    year = {2006},
    month = {jun},
    publisher = {{ACM}},
    author = {Mikolaj Boja{\'{n}}czyk and Claire David and Anca Muscholl and Thomas Schwentick and Luc Segoufin},
    title = {Two-variable logic on data trees and {XML} reasoning},
    booktitle = {Proceedings of the twenty-fifth {ACM} {SIGMOD}-{SIGACT}-{SIGART} symposium on Principles of database systems}
}

@inproceedings{Boja_czyk_2006, doi = {10.1145/1142351.1142354}, url = {https://doi.org/10.1145%2F1142351.1142354}, year = {2006}, month = {jun}, publisher = {{ACM}}, author = {Mikolaj Boja{\'{n}}czyk and Claire David and Anca Muscholl and Thomas Schwentick and Luc Segoufin}, title = {Two-variable logic on data trees and {XML} reasoning}, booktitle = {Proceedings of the twenty-fifth {ACM} {SIGMOD}-{SIGACT}-{SIGART} symposium on Principles of database systems} }