@article{Hubi_ka_2005,
    doi = {10.1016/j.ejc.2004.01.008},
    url = {https://doi.org/10.1016%2Fj.ejc.2004.01.008},
    year = {2005},
    month = {jul},
    publisher = {Elsevier {BV}},
    volume = {26},
    number = {5},
    pages = {765--778},
    author = {Jan Hubi{\v{c}}ka and Jaroslav Ne{\v{s}}et{\v{r}}il},
    title = {Universal partial order represented by means of oriented trees and other simple graphs},
    journal = {European Journal of Combinatorics}
}

@article{Hubi_ka_2005, doi = {10.1016/j.ejc.2004.01.008}, url = {https://doi.org/10.1016%2Fj.ejc.2004.01.008}, year = {2005}, month = {jul}, publisher = {Elsevier {BV}}, volume = {26}, number = {5}, pages = {765--778}, author = {Jan Hubi{\v{c}}ka and Jaroslav Ne{\v{s}}et{\v{r}}il}, title = {Universal partial order represented by means of oriented trees and other simple graphs}, journal = {European Journal of Combinatorics} }