Michael Byrd. Eventual permanence. Notre Dame Journal of Formal Logic, 21(3):591-601, 1980. [doi]
@article{Byrd80,
title = {Eventual permanence},
author = {Michael Byrd},
year = {1980},
doi = {10.1305/ndjfl/1093883183},
url = {http://dx.doi.org/10.1305/ndjfl/1093883183},
researchr = {https://researchr.org/publication/Byrd80},
cites = {0},
citedby = {0},
journal = {Notre Dame Journal of Formal Logic},
volume = {21},
number = {3},
pages = {591-601},
}