Ning Peng, and Lihong Xu. “Correlation Coefficient of Single-Valued Neutrosophic Set for Linking Education for Sustainable Development With Early Learning Outcomes: A Preschool Evaluation Study”. Neutrosophic Sets and Systems, vol. 87, Sept. 2025, pp. 1083-91, https://fs.unm.edu/nss8/index.php/111/article/view/6778.