BibTeX: 
@article{CZH_Universal_ConstructionsAFP,
author = {Mihails Milehins},
title = {Category Theory for ZFC in HOL III: Universal Constructions},
journal = {Archive of Formal Proofs},
month = sep,
year = 2021,
note = {\url{https://isaafp.org/entries/CZH_Universal_Constructions.html},
Formal proof development},
ISSN = {2150914x},
}
