@article{Thorup_2004,
    doi = {10.1145/1039488.1039493},
    url = {https://doi.org/10.1145%2F1039488.1039493},
    year = {2004},
    month = {nov},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {51},
    number = {6},
    pages = {993--1024},
    author = {Mikkel Thorup},
    title = {Compact oracles for reachability and approximate distances in planar digraphs},
    journal = {Journal of the {ACM}}
}

@article{Thorup_2004, doi = {10.1145/1039488.1039493}, url = {https://doi.org/10.1145%2F1039488.1039493}, year = {2004}, month = {nov}, publisher = {Association for Computing Machinery ({ACM})}, volume = {51}, number = {6}, pages = {993--1024}, author = {Mikkel Thorup}, title = {Compact oracles for reachability and approximate distances in planar digraphs}, journal = {Journal of the {ACM}} }