Rahman, K., M. A. Khan, M. Ullah, and A. Fahmi. “Multiple Attribute Group Decision Making for Plant Location Selection With Pythagorean Fuzzy Weighted Geometric Aggregation Operator”. The Nucleus, vol. 54, no. 1, Mar. 2017, pp. 66-74, http://202.83.167.189/index.php/Nucleus/article/view/107.