@article{ffgl-plctptc-09 , author = "Jan Foniok and Komei Fukuda and Bernd G{\"a}rtner and Hans-Jakob L{\"u}thi" , title = "Pivoting in Linear Complementarity: Two Polynomial-Time Cases" , journal ="Discrete Comput. Geom." , volume = "42" , issue = "2" , year = "2009" , pages = "187-205" }