Jan Foniok Komei Fukuda Bernd Gärtner Hans-Jakob Lüthi Pivoting in Linear Complementarity: Two Polynomial-Time Cases. 187-205 2009 42 Discrete & Computational Geometry 2 http://dx.doi.org/10.1007/s00454-009-9182-2 db/journals/dcg/dcg42.html#FoniokFGL09