@article{Fairtlough_1992,
    doi = {10.1016/0890-5401(92)90027-d},
    url = {https://doi.org/10.1016%2F0890-5401%2892%2990027-d},
    year = {1992},
    month = {aug},
    publisher = {Elsevier {BV}},
    volume = {99},
    number = {2},
    pages = {123--153},
    author = {M.V.H. Fairtlough and S.S. Wainer},
    title = {Ordinal complexity of recursive definitions},
    journal = {Information and Computation}
}

@article{Fairtlough_1992, doi = {10.1016/0890-5401(92)90027-d}, url = {https://doi.org/10.1016%2F0890-5401%2892%2990027-d}, year = {1992}, month = {aug}, publisher = {Elsevier {BV}}, volume = {99}, number = {2}, pages = {123--153}, author = {M.V.H. Fairtlough and S.S. Wainer}, title = {Ordinal complexity of recursive definitions}, journal = {Information and Computation} }