9Greco S, Matarazzo B, Slowinski R. Rough Approximation by Dominance Relations. International Journal of Inteligent Systems, 2002,17:153-171
10Greeo S, Matarazzo B, Slowinski R. Rough Sets Methodology for Sorting Problems in Presence of Multiple Attributes and Criteria. European Journal of Operational Reaseareh, 2002,138 : 247- 259
