* {{cite book|last1=Cottle|first1=Richard W.|last2=Pang|first2=Jong-Shi|last3=Stone|first3=Richard E.|title=The linear complementarity problem | series=Computer Science and Scientific Computing|publisher=Academic Press, Inc.|___location=Boston, MA|year=1992|pages=xxiv+762 pp|isbn=978-0-12-192350-1 | mr = 1150683 }}
* {{cite book|author-link1=Michael R. Garey|first1=Michael R.|last1=Garey|author-link2=David S. Johnson|last2=Johnson|first2=David S.| year = 1979 | title = Computers and Intractability: A Guide to the Theory of NP-Completeness |url=https://archive.org/details/computersintract0000gare|url-access=registration| publisher = W.H. Freeman | isbn = 978-0-7167-1045-5}} A6: MP2, pg.245.
