“…Note that researchers can extend the UAO operator by adding some other key concepts like distance measures (Zeng, Merigó, & Su, 2013), fuzzy systems (Zeng, Su, & Le, 2012), power aggregations (Wei, Zhao, Wang, & Lin, 2013), Choquet integrals (Belles, Merigó, Guillen, & Santolino, 2014;Wei, Lin, Zhao, & Wang, 2014) and generalized multiple aggregations (Zhou, Chen, & Liu, 2013).…”