5Zadeh L A. Fuzzy Sets[ J]. Inform and Control, 1995, 8:338 - 356.
6Bellman R E, Zadeh L A. Decision -making in A Fuzzy Environment[ J ]. Management Sci, 1970,17 (4) :141 - 164.
7Hong D J, Choi C H. Muhicriteria Fuzzy Decision - making Problems Based on Vague Set Theory[J]. Fuzzy Sets and Systems ,2000,114 : 103 - 113.
8Bustince H, BuriUo P. Vague Sets are Intuitionistic Fuzzy Sets[ J]. Fuzzy Sets and Systems,1996,79:403 -405.
9Herrera F, Herrera Viedma E, Chiclana F. Multiperson Decision- making Based on Muhiplicative Preference Relations [ M ]. Paris : European Journal of Operational Reasearch,2001.
