Florentin Smarandache, Maikel Y. Leyva Vázquez, & Mohamed Abdel‑Basset. (2025). Preface - Neutrosophic Sets and Systems, {Special Issue: Neutrosophic and Plithogenic Approaches in Data Science and Multivariate Analysis: Contributions from the IX Ibero-American Biometry Meeting}, Vol. 89, 2025. Neutrosophic Sets and Systems, 89, 1-6. https://fs.unm.edu/nss8/index.php/111/article/view/6714