Petr Hájek. On equality and natural numbers in Cantor-Łukasiewicz set theory. Logic Journal of the IGPL, 21(1):91-100, 2013. [doi]
@article{Hajek13,
title = {On equality and natural numbers in Cantor-Łukasiewicz set theory},
author = {Petr Hájek},
year = {2013},
doi = {10.1093/jigpal/jzq019},
url = {http://dx.doi.org/10.1093/jigpal/jzq019},
researchr = {https://researchr.org/publication/Hajek13},
cites = {0},
citedby = {0},
journal = {Logic Journal of the IGPL},
volume = {21},
number = {1},
pages = {91-100},
}