1. Extension principle and fuzzy number;Luo Chengzhong;Fuzzy Mathematics,1984
2. Exploring the interface between hierachies, multiple objectives and fuzzy sets;Saaty;Fuzzy Sets and Systems,1978
3. A fuzzy extension of Saaty's priority theory;Van Laarhoven;Fuzzy Sets and Systems,1983
4. Fuzzy Sets and Fall-Shadow of Random Set;Wang Peizhuang,1985
5. The Principle of the AHP;Xu Shubo,1988