Rahman, K., A. Ali, M. Shakeel, M. S. A. Khan, and Murad Ullah. “Pythagorean Fuzzy Weighted Averaging Aggregation Operator and Its Application to Decision Making Theory”. The Nucleus 54, no. 3 (September 29, 2017): 190–196. Accessed May 3, 2024. http://202.83.167.189/index.php/Nucleus/article/view/184.