Marco Riccardi. Object-Free Definition of Categories. Formalized Mathematics, 21(3):193-205, 2013. [doi]
@article{Riccardi13,
title = {Object-Free Definition of Categories},
author = {Marco Riccardi},
year = {2013},
doi = {10.2478/forma-2013-0021},
url = {http://dx.doi.org/10.2478/forma-2013-0021},
researchr = {https://researchr.org/publication/Riccardi13},
cites = {0},
citedby = {0},
journal = {Formalized Mathematics},
volume = {21},
number = {3},
pages = {193-205},
}