@article{Bar_t_2006,
    doi = {10.1007/s00373-005-0627-y},
    url = {https://doi.org/10.1007%2Fs00373-005-0627-y},
    year = {2006},
    month = {jun},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {22},
    number = {2},
    pages = {161--172},
    author = {J{\'{a}}nos Bar{\'{a}}t},
    title = {Directed Path-width and Monotonicity in Digraph Searching},
    journal = {Graphs and Combinatorics}
}

@article{Bar_t_2006, doi = {10.1007/s00373-005-0627-y}, url = {https://doi.org/10.1007%2Fs00373-005-0627-y}, year = {2006}, month = {jun}, publisher = {Springer Science and Business Media {LLC}}, volume = {22}, number = {2}, pages = {161--172}, author = {J{\'{a}}nos Bar{\'{a}}t}, title = {Directed Path-width and Monotonicity in Digraph Searching}, journal = {Graphs and Combinatorics} }