Zhou, Zhexuan, Yajie Dou, Xiaoxiong Zhang, Danling Zhao, and Yuejin Tan. “A Group Decision-Making Model for Wastewater Treatment Plans Selection Based on Intuitionistic Fuzzy Sets”. Journal of Environmental Engineering and Landscape Management 26, no. 4 (November 15, 2018): 251-260. Accessed August 22, 2019. https://journals.vgtu.lt/index.php/JEELM/article/view/6122.