Krzysztof Dembczynski Salvatore Greco Roman Slowinski Rough set approach to multiple criteria classification with imprecise evaluations and assignments. 626-636 2009 198 European Journal of Operational Research 2 http://dx.doi.org/10.1016/j.ejor.2008.09.033 db/journals/eor/eor198.html#DembczynskiGS09