6Wu L F, Liu S F, Yao L G, et al. Grey convex relational degree and its application to evaluate regional economic sustainability[J]. Scientia Iranica, 2012, 19(6): 1437-1444.
7Behzadian M, Otaghsara S K, Yazdani M, et al. A state-of the-art survey of TOPSIS applications[J]. Expert Systems with Applications, 2012, 39(17): 13051-13069.
8Gokhan Torlak, Mehmet Sevkli, Mehmet Sanal, et at. Analyzing business competition by using fuzzy TOPSIS method: An example of Turkish domestic airline industry[J]. Expert Systems with Applications, 2011, 38(4): 3396-3406.
