BibTeX: 
@article{Finite_Automata_HFAFP,
author = {Lawrence C. Paulson},
title = {Finite Automata in Hereditarily Finite Set Theory},
journal = {Archive of Formal Proofs},
month = feb,
year = 2015,
note = {\url{http://isaafp.org/entries/Finite_Automata_HF.shtml},
Formal proof development},
ISSN = {2150914x},
}
