BibTeX: 
@article{FarkasAFP,
author = {Ralph Bottesch and Max W. Haslbeck and RenĂ© Thiemann},
title = {Farkas' Lemma and Motzkin's Transposition Theorem},
journal = {Archive of Formal Proofs},
month = jan,
year = 2019,
note = {\url{http://isaafp.org/entries/Farkas.html},
Formal proof development},
ISSN = {2150914x},
}
