Yasuo Kawahara, Michael Winter. Cardinality functions in allegories. Journal of Logic and Algebraic Programming, 79(8):830-844, 2010. [doi]
@article{KawaharaW10,
title = {Cardinality functions in allegories},
author = {Yasuo Kawahara and Michael Winter},
year = {2010},
doi = {10.1016/j.jlap.2010.07.018},
url = {http://dx.doi.org/10.1016/j.jlap.2010.07.018},
researchr = {https://researchr.org/publication/KawaharaW10},
cites = {0},
citedby = {0},
journal = {Journal of Logic and Algebraic Programming},
volume = {79},
number = {8},
pages = {830-844},
}