Averaging Aggregation Operators with Interval Pythagorean Trapezoidal Fuzzy Numbers and Their Application to Group Decision Making. Punjab Univ. J. Math. [Internet]. 2018 Jun. 30 [cited 2025 Jun. 29];50(2):141-64. Available from: https://pujm.pu.edu.pk/index.php/pujm/article/view/135