Ying Zhong, Yanyan Yao, and Xiaoting Huang. 2025. “Bipolar Pythagorean Neutrosophic Aggregation Operator for Voice of the Guest: Evaluating Hotel Management Service Quality through Customer Feedback ”. Neutrosophic Sets and Systems 87 (September): 1063-72. https://fs.unm.edu/nss8/index.php/111/article/view/6776.