Suchitra Pattnaik, Mitali Madhusmita Nayak, Milu Acharya. “Pythagorean Fuzzy Entropy Order Quantity Model for Imperfect Quality Items With Emission Considerations”. Design Engineering (August 25, 2021): 10173 - 10189. Accessed May 7, 2024. http://thedesignengineering.com/index.php/DE/article/view/3764.