Liu, Peide, and Xiaocun Yu. “Density Aggregation Operators Based on the Intuitionistic Trapezoidal Fuzzy Numbers for Multiple Attribute Decision Making”. Technological and Economic Development of Economy 19, no. 1 (January 28, 2014): S454-S470. Accessed November 13, 2024. https://gc.vgtu.lt/index.php/TEDE/article/view/4339.