@article{Kwon_2021,
    doi = {10.1016/j.jctb.2021.01.005},
    url = {https://doi.org/10.1016%2Fj.jctb.2021.01.005},
    year = {2021},
    month = {jul},
    publisher = {Elsevier {BV}},
    volume = {149},
    pages = {76--91},
    author = {O-joung Kwon and Rose McCarty and Sang-il Oum and Paul Wollan},
    title = {Obstructions for bounded shrub-depth and rank-depth},
    journal = {Journal of Combinatorial Theory, Series B}
}

@article{Kwon_2021, doi = {10.1016/j.jctb.2021.01.005}, url = {https://doi.org/10.1016%2Fj.jctb.2021.01.005}, year = {2021}, month = {jul}, publisher = {Elsevier {BV}}, volume = {149}, pages = {76--91}, author = {O-joung Kwon and Rose McCarty and Sang-il Oum and Paul Wollan}, title = {Obstructions for bounded shrub-depth and rank-depth}, journal = {Journal of Combinatorial Theory, Series B} }