@article{Oum_2007,
    doi = {10.1002/jgt.20280},
    url = {https://doi.org/10.1002%2Fjgt.20280},
    year = {2007},
    month = {nov},
    publisher = {Wiley},
    volume = {57},
    number = {3},
    pages = {239--244},
    author = {Sang-il Oum},
    title = {Rank-width is less than or equal to branch-width},
    journal = {Journal of Graph Theory}
}

@article{Oum_2007, doi = {10.1002/jgt.20280}, url = {https://doi.org/10.1002%2Fjgt.20280}, year = {2007}, month = {nov}, publisher = {Wiley}, volume = {57}, number = {3}, pages = {239--244}, author = {Sang-il Oum}, title = {Rank-width is less than or equal to branch-width}, journal = {Journal of Graph Theory} }