@article{de_Jongh_1977,
    doi = {10.1016/1385-7258(77)90067-1},
    url = {https://doi.org/10.1016%2F1385-7258%2877%2990067-1},
    year = {1977},
    publisher = {Elsevier {BV}},
    volume = {80},
    number = {3},
    pages = {195--207},
    author = {D.H.J de Jongh and Rohit Parikh},
    title = {Well-partial orderings and hierarchies},
    journal = {Indagationes Mathematicae (Proceedings)}
}

@article{de_Jongh_1977, doi = {10.1016/1385-7258(77)90067-1}, url = {https://doi.org/10.1016%2F1385-7258%2877%2990067-1}, year = {1977}, publisher = {Elsevier {BV}}, volume = {80}, number = {3}, pages = {195--207}, author = {D.H.J de Jongh and Rohit Parikh}, title = {Well-partial orderings and hierarchies}, journal = {Indagationes Mathematicae (Proceedings)} }