BibTeX: 
@article{Card_Number_PartitionsAFP,
author = {Lukas Bulwahn},
title = {Cardinality of Number Partitions},
journal = {Archive of Formal Proofs},
month = jan,
year = 2016,
note = {\url{http://isaafp.org/entries/Card_Number_Partitions.html},
Formal proof development},
ISSN = {2150914x},
}
