BibTeX: 
@article{Adaptive_State_CountingAFP,
author = {Robert Sachtleben},
title = {Formalisation of an Adaptive State Counting Algorithm},
journal = {Archive of Formal Proofs},
month = aug,
year = 2019,
note = {\url{https://isaafp.org/entries/Adaptive_State_Counting.html},
Formal proof development},
ISSN = {2150914x},
}
