@article{Pitts_1994,
    doi = {10.1016/0304-3975(94)90014-0},
    url = {https://doi.org/10.1016%2F0304-3975%2894%2990014-0},
    year = {1994},
    month = {feb},
    publisher = {Elsevier {BV}},
    volume = {124},
    number = {2},
    pages = {195--219},
    author = {Andrew M Pitts},
    title = {A co-induction principle for recursively defined domains},
    journal = {Theoretical Computer Science}
}

@article{Pitts_1994, doi = {10.1016/0304-3975(94)90014-0}, url = {https://doi.org/10.1016%2F0304-3975%2894%2990014-0}, year = {1994}, month = {feb}, publisher = {Elsevier {BV}}, volume = {124}, number = {2}, pages = {195--219}, author = {Andrew M Pitts}, title = {A co-induction principle for recursively defined domains}, journal = {Theoretical Computer Science} }