article{Foniok2014155, title = "Counting unique-sink orientations ", journal = "Discrete Applied Mathematics ", volume = "163, Part 2", number = "0", pages = "155 - 164", year = "2014", note = "Optimal Discrete Structures and Algorithms \{ODSA\} 2010 ", issn = "0166-218X", doi = "http://dx.doi.org/10.1016/j.dam.2013.07.017", url = "http://www.sciencedirect.com/science/article/pii/S0166218X13003284", author = "Jan Foniok and Bernd Gärtner and Lorenz Klaus and Markus Sprecher", keywords = "Unique-sink orientation", keywords = "Linear complementarity problem", keywords = "Pivoting", keywords = "P-matrix", keywords = "K-matrix " }