Jason Morton Lior Pachter Anne Shiu Bernd Sturmfels Oliver Wienand Geometry of rank tests. 207-214 2006 Probabilistic Graphical Models http://www.utia.cas.cz/files/mtr/pgm06/7_paper.pdf conf/pgm/2006 db/conf/pgm/pgm2006.html#MortonPSSW06