Gong, Zaiwu, Xiaoxia Xu, Yingjie Yang, Yi Zhou, and Huanhuan Zhang. “The Spherical Distance for Intuitionistic Fuzzy Sets and Its Application in Decision Analysis”. Technological and Economic Development of Economy 22, no. 3 (May 12, 2016): 393-415. Accessed November 28, 2024. https://mma.vgtu.lt/index.php/TEDE/article/view/731.