@article{Doornbos_1998,
    doi = {10.1093/jigpal/6.2.195},
    url = {https://doi.org/10.1093%2Fjigpal%2F6.2.195},
    year = {1998},
    month = {mar},
    publisher = {Oxford University Press ({OUP})},
    volume = {6},
    number = {2},
    pages = {195--201},
    author = {H Doornbos},
    title = {On the union of well-founded relations},
    journal = {Logic Journal of {IGPL}}
}

@article{Doornbos_1998, doi = {10.1093/jigpal/6.2.195}, url = {https://doi.org/10.1093%2Fjigpal%2F6.2.195}, year = {1998}, month = {mar}, publisher = {Oxford University Press ({OUP})}, volume = {6}, number = {2}, pages = {195--201}, author = {H Doornbos}, title = {On the union of well-founded relations}, journal = {Logic Journal of {IGPL}} }