Charles F. Kielkopf. The intensionality of the predicate '_ is recursive'. Notre Dame Journal of Formal Logic, 19(1):165-173, 1978. [doi]
@article{Kielkopf78,
title = {The intensionality of the predicate '_ is recursive'},
author = {Charles F. Kielkopf},
year = {1978},
doi = {10.1305/ndjfl/1093888222},
url = {http://dx.doi.org/10.1305/ndjfl/1093888222},
researchr = {https://researchr.org/publication/Kielkopf78},
cites = {0},
citedby = {0},
journal = {Notre Dame Journal of Formal Logic},
volume = {19},
number = {1},
pages = {165-173},
}