BibTeX: 
@article{Interval_Arithmetic_Word32AFP,
author = {Brandon Bohrer},
title = {Interval Arithmetic on 32bit Words},
journal = {Archive of Formal Proofs},
month = nov,
year = 2019,
note = {\url{http://isaafp.org/entries/Interval_Arithmetic_Word32.html},
Formal proof development},
ISSN = {2150914x},
}
