BibTeX: 
@article{Van_der_WaerdenAFP,
author = {Katharina Kreuzer and Manuel Eberl},
title = {Van der Waerden's Theorem},
journal = {Archive of Formal Proofs},
month = jun,
year = 2021,
note = {\url{https://isaafp.org/entries/Van_der_Waerden.html},
Formal proof development},
ISSN = {2150914x},
}
