BibTeX: 
@article{Smooth_ManifoldsAFP,
author = {Fabian Immler and Bohua Zhan},
title = {Smooth Manifolds},
journal = {Archive of Formal Proofs},
month = oct,
year = 2018,
note = {\url{http://isaafp.org/entries/Smooth_Manifolds.html},
Formal proof development},
ISSN = {2150914x},
}
