@inproceedings{Lubarsky,
    doi = {10.1109/lics.1989.39189},
    url = {https://doi.org/10.1109%2Flics.1989.39189},
    publisher = {{IEEE} Comput. Soc. Press},
    author = {R.S. Lubarsky},
    title = {mu -definable sets of integers},
    booktitle = {[1989] Proceedings. Fourth Annual Symposium on Logic in Computer Science}
}

@inproceedings{Lubarsky, doi = {10.1109/lics.1989.39189}, url = {https://doi.org/10.1109%2Flics.1989.39189}, publisher = {{IEEE} Comput. Soc. Press}, author = {R.S. Lubarsky}, title = {mu -definable sets of integers}, booktitle = {[1989] Proceedings. Fourth Annual Symposium on Logic in Computer Science} }